Plink Issues

on my stick, I do, lp-lp+mp and then usually in the 5 hit guile combo i get four light punches and no flash kick or boom. So when I press the buttons on a stick it goes.

light punch,light punch,lightpunch + medium punch and light punch comes out when i press medium, also, on the inputs LP and MP only show, not another one under? help?

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