Jake Paul is NOT backing out of his upcoming boxing match with NBA star Nate Robinson despite the mysterious FBI investigation involving him, TMZ Sports has learned.

In fact, our sources say Jake is focusing on the fight to help keep his mind off the ordeal while it all plays out.

We did some digging to find out if Jake's legal situation had anything to do with the new date -- and as one source put it, "As of right now, Jake Paul is still confirmed.

We're told Jake has also cut ties with former friend Armani Izadi -- whose Vegas home was also raided last week.