Note: it turns out that the exact same thing occurs with retail Megaman X6, Megaman X5 and Megaman X4 and it is just an emulation issue.

I really want to play the Megaman X6 prototype at full speed (I can only access my phone, which isn't good for PS1), so I used WiiSX. I previously used WiiSX to play other games like Metal Slug X and the Megaman 8 prototypes. I managed to get past the intro stage all fine so as you would expect, I w...