I have these button problems.. and it's getting really annoying

ok, so it started 5 months ago, whenever I move the D pad, the analog stick under it starts doing things on it own, like move left up, but I can't see it moving, it just moves at it self from the inside, and stuff that's really annoying, and it's very hard to do anything now, it always moves at it self, and in the GBA emulator it's very annoying because maybe I'm trying to make the settings, and load slot, it always moves at it self like insane, and changes the setting, ****.. it's just... annoying.. and I think I need to open my PSP and see what's wrong..
has anyone else got that button problem?

I had this before... i changed my faceplate to a Pink one (lol)

I tightned the screw one the left harder than the right! try unscrewing and screwing back in the screws!

Also inside the PSP there is a gold slip! if this has moved you will have to move it back into place!

The analog itself inside the PSP... all those screws need to be level!