Logan Paul insists the dust-up between his brother and Floyd Mayweather was NOT a scripted stunt ... telling TMZ Sports, "I f**king wish that wasn't real."
"I wish it was staged," Logan added ... "That s**t is not funny. It's not fun for anyone."
As we previously reported, Jake Paul took over the media event at Hard Rock Stadium in Miami on Thursday and got right into Floyd's face ... stealing his baseball cap and touching off a violent altercation.
Floyd was PISSED -- chasing after Jake while screaming that he was going to "kill" the YouTube superstar.