ORIGINAL: KodiakArcher
Check your tuning to make sure that the arrow isn't nock low on the string. If it is, either move the rest down or the nock point up until the arrow is dead level.
Exactly, assuming your bow was tuned prior to the WB, it's time to move the WB down. Otherwise it's a matter of tuning both nock up/down and WB up/down depending. If you don't understand the fine line of tuning, time to find someone who does. (respectable pro shop).