Capacitor on the paddles ?

During some test on a new build keyer, i did find a interesting issue.

On each paddle input i did have a capacitor to gnd to be sure not to have emc problems.

BUT when i did very QRQ the keyer did have small problems to get the singel DITs ..

Then i did remove the capacitor completely and then i works like a champ ;o) 

Just an idea to check by your self ....