When ever I log onto a server/world blocks start flashing everywhere.

The game acts like its rendering five different worlds at once and can't choose between them. My game will flash different biomes in weird patterns, for ex: If i stand still my game will flash for a bit but then it stops. ill just see repeating patterns of trees. but if i move/look everything will start flashing again changing patterns at like a million times per sec with different blocks and different patterns. Upon writing this i have come upon a sort of fix, i updated to java 8 and all seems to be in working order. if this happens again ill let you know.