Hori FS-EX Wirless Joy Stick Problems

Hello everyone, Im new to the site, and this is my first post so please forgive me if this has been addressed somewhere already.

I’ve been having some recent trouble with my stick as of late while playing SSF4, it seems that sometimes when I press particular inputs I get a random extra input along side it, for example

If I press mid kick I get Light punch and mid kick at the same time

If I press light kick I get light punch as well, turning it into a throw

sometimes while doing certain movements on the joy stick I get light punch

and the number one worst one is pressing all three kick buttons I get a light punch mixed in turning it into a throw.

Ive tried taking the batteries out, restarting the stick etc, nothing seems to help.
I’ve recently popped open the stick but there seem to be no physical problems, any suggestions as to what may be the problem?

PS. Sorry no pictures of the opened stick, I’ll take one when I get the chance.