I have a Drop CTRL keyboard. I have the key 2 spots to the right assigned as "Alt" and it requires a very firm downward push. I often miss a few multi-key key combos because it doesn't seem to register unless I directly push down with my index finger. I wasn't sure if some of the slots were any different in how they responded.
A few things I have tested and they didn't help at all:
* I have swapped the switch with a few other switches (my box of came with extra switches)
* I have used a key listener program and I know this isn't related to any kind of software as it happens on other computers as well