Valid method of testing your stick in sf4

Hey guys,

I’ve been attempting to HJC with Viper and my consistency is somewhat lacking.
I turned on input feature to see what was happening.

I’ve noticed with my stick if I do a qcf/b when releasing to neutral I might get a f or b appended to it.

When I attempt to jump f or jump b I notice that the inputs are not always uf or ub, but sometimes u then b, or up then f.

I know my hori is shit – but I don’t know enough about the sf4 engine to determine if u then f is the same as uf. While the same action is produced the inputs are different.