"The IG probe identified at least 17 "significant inaccuracies and omissions" in the Page applications and said they would launch a new audit into the FISA process."
So the FBI is either incompetent or these "errors" were ignored on purpose in order to obtain the FISA warrant on Page.
https://www.foxnews.com/politics/fisa-report-doj-watchdog-releases-findings-on-russia-probe-surveillance