Smash Bros. Brawl Problem (USB LOADER GX)

(It's not the usual error/ the black)

Skip if you want:
Sorry for reuploading in a different topic, it's just that this text applies to more than one topic, and since i didn't know where to upload it and since no one clicked on my post on the other topic, i posted this here too.

Problem:
I own a copy of brawl, and decided to back it up and test, just in case(testing from USB loader gx, the latest version). If i press a button, it sometimes counts it as 2 presses(actually it is more accurate to say that it pauses and resume a press, as seen when moving the hand in the character menu or when holding A when choosing a character, which results in selecting and de-selecting). I downloaded a file from the internet and it does it on that file as well. Is there a fix?

Information:
This problems persists only in Brawl, ive tried 3 different controllers with/without nunchucks/classic controllers. The intro lags in certain parts but only a little.