Ah, that explained a lot, but it's still glitching for a bit now..
By the way, i connected a 7805 to power the tlc's
the wire from the 5v-out from the arduino was still connected to the powerlane in the breadboard, and now the 7805 is powering the arduino through the 5v out pin on the arduino. Can that cause any damage or anything?
Pretty much exactly like this