Compiled from the website of Shaikh Muhammad ibn Saleh Al-Munajjid Hafidhaullah, islamqa.info and some other sites as well.
1. The chains of narration of the angel of death asking the permission of the Prophet ﷺ before taking away his soul are either weak or fabricated.
2. The Prophet ﷺ was not born circumcised, he ﷺ was circumcised on the seventh day according to Arab tradition.
3. It is not authentically proven that Al-Battar was a sword of the Prophet ﷺ.
4.The idea that the Prophet ﷺ went and came back during the night of the Isra’ (Night Journey) and his bed had not grown cold is not proven; rather it is one of the lies that are told by people.
https://islamqa.info/en/answers/203789/a-fabricated-report-about-the-isra-and-miraaj
5. The story that the Prophet ﷺ plannned or approved of the assassination of Asma bint Marwan is false.
https://islamqa.info/en/answers/177694/the-story-of-the-killing-of-asma-bint-marwaan-is-false
6.When the Prophet ﷺ was born, he rested on his arms, raising his head to heaven-a weak report.
7. Is it proven that Umar ibn al-Khattab (رضي الله عنه) buried his daughter during the days of ignorance(Jahiliyyah)?
Answer from islamqa translated.
8. Did Umar (رضي الله عنه) pray in the Church when he captured Bait Al-Maqdis?
9. There is nothing authentic that Nimrod, the king of Iraq, was informed that Prophet Ibraheem would be born by his astrologers.
10. It is not proven from any source that the Prophet ﷺ or the Sahaba called the year Abu Talib and Khadeeja (رضي الله عنها) died as ‘The Year of Grief’.
11. Narrations that mention that Aisha (رضي الله عنها) and Muawiya (رضي الله عنه) believed that Al-Isra wal-Miraj did not happen by the Prophet ﷺ physically and only by the soul are unauthentic.
Translation in english:
12. It is not proven anywhere that when the Prophet ﷺ was born Angel Jibraeel came down with three flags, and posted one flag on the Kabah, another on Bait-ul-Maqdia and another on Amina’s house.
13. The Prophet ﷺ did not breath his last on the chest of Ali (رضي الله عنه) as mentioned by some of the Shia Rafidha. Rather he ﷺ died with his head on Ummul Mumineen Aisha (رضي الله عنها).
https://islamqa.info/ar/answers/259216/هل-صح-ان-النبي-صلى-الله-عليه-وسلم-توفي-وهو-مستند-على-صدر-علي
14. It is wrongly reported in some books of history that the Prophet ﷺ married more than 20 or 30 women. He ﷺ married and consumated his marriage with 11 women they are our Ummahat-ul-Mumineen (رضي الله عنهن). As for the othet three whom he married and divorced or did not consumate they’re not included amongst his ﷺ wives.
15. The phrase said by the Prophet ﷺ on the day of the conquest of Makkah to the Quraish ‘Izhabu fa antum tulaqa (Go for all of you are free)’ is not proven to be authentic. [But he ﷺ did forgive all the people of Makkah and granted them safety]
https://islamqa.info/ar/answers/290672/حديث-اذهبوا-فانتم-الطلقاء
16. Mariya Al-Qibtiyya (رضي الله عنها) was a slave girl of the Prophet ﷺ and not a wife as many Muslims ignorantly claim.
https://islamqa.info/en/answers/47572/was-mariyah-al-qibtiyyah-one-of-the-mothers-of-the-believers
17. Is it proven that ‘Umar (may Allah be pleased with him) wrote a letter to the Nile in Egypt so that its water would flow by Allah’s leave?[Not proven authentically]
18. It is not proven authentically from any Islamic source that Yousuf (عليه السلام) married the wife of Azeez, the governor of Egypt.
19. Is it true that Adam (peace be upon him) came down in India and that Hawwa’ came down in Jeddah?[Not true]
20. The story of Ali (رضي الله عنه) leaving a Kafir free after the Kafir spat on his face, is a story without any source or chain.
https://islamqa.info/ar/answers/224471/حكاية-ان-عليا-رضي-الله-عنه-ترك-قتل-المشرك-لما-بصق-في-وجهه
21. The story that when the Prophet ﷺ and Abu Bakr (رضي الله عنه) were hiding in Ghar Ath-Thawr, a spider spun a web on the mouth of the cave and a pigeon laid eggs outside the cave.
22. The story of Ali (رضي الله عنه) fighting some of the Jinn is false.
https://islamqa.info/en/answers/10359/the-claims-that-ali-fought-against-the-jinn-are-baseless-lies
23. It is not right to say that the Prophet ﷺ has 99 names. Many of the ‘so called names’ are just his descriptions.
24. The story of the Jew ,Zaid bin Sanah, roughing up the Prophet ﷺ in front of his Sahaba and taking back his loan is a weak report.
قصة إسلام زيد بن سعنة هل هي صحيحة ؟
https://www.google.com/amp/s/islamqa.info/amp/ar/answers/254556
25. The story that Abu Jahl’s head was severed and presented to the Prophet ﷺ is weak.
http://fatwa.islamweb.net/fatwa/index.php?page=showfatwa&Option=FatwaId&Id=266317
26. It is not true that after Al-Isra wal-Meraj some Sahaba left Islam because of not believing in what Nabi ﷺ said.
https://ar.islamway.net/article/26289/هل-ارتد-أحد-من-الصحابة
27. Story of the Prophet ﷺ joking with Ali ibn Abi Talib (رضي الله عنه) whilst eating dates is baseless and not proven from any source.
28. The story of a man who came to Umar to complain about his wife and Umar (رضي الله عنه) being patient with his wife who was scolding him is baseless, has no origin.
https://islamqa.info/amp/ar/answers/179442
29. The story of Abu Bakr going out of Madinah to look after the needs of an old, frail and blind lady and Umar ibn al-Khattab following him is very weak.
Saheehus-Seerah 