Why do replays get fucked up?

I noticed that after saving some replays of me and my bro playing, i would replay it and notice a lot of times random shit happens in the match??:arazz::arazz::arazz:

In like 2 of the matches the middle of the round it just goes blank and no one is doing anything, then on another replay it showed the opponet taunting in the middle of the match when that clearly never happened

US version of 3rd Strike fucks up the replays sometimes. Japanese version doesn’t do it (or at least I haven’t run into the problem yet on the Japanese version).

it only messes up replay’s for me if the memory card is close to full when i save it.