So I supposed that GSX is the bandit. Or am I wrong?
I'm not sure why you are using such "bandit" term. If there's a key conflict, meaning two addons are using the same key, which seems to be the most likely cause of your issue, it's NOBODY'S FAULT: the keyboard has a limited number of keys, lots of them are already taken by the sim, so there's a very limited number of keys addons can use before starting to conflict with each other.
It's up to you to check if you have conflicting keys between addons, to sort them out.
Which is why, GSX being the flexible program it is, allows you to redefine its own keys, using the "Key Mappings" menu. So, if the other "bandit" is allowing to do the same, you can choose if you prefer to remap they key *there*, or in GSX.
If the other "bandit", instead, doesn't allow to remap its key, just change the one used by GSX, until there's no conflict anymore.