PSP games

I have crisis core, ff7, an snes emulator and a gbc emulator on my psp
the problem is whenever I run any of them, there's an repeating input problem
by which I mean (for example) I'm always running up or scrolling up whenever I'm playing any of the games, even when Im not hitting anything. I've tried removing the memory stick, restarting the psp, removing the battery.
Any suggestions or places to send me to would be much appreciated.

theres probable something wrong with your analog stick or d-pad try and clean them.