It looks like either the Map layer or the Dynamic Lighting layer has moved. Beyond accidental movement by the GM, I'm not sure what could cause it. The easiest fix would probably be to go to the DL layer, hit CTRL-A to select all, then push the right arrow on the keyboard. Edit - on second thoughts... what are the white dots? Are they on the Token layer? If they are, it looks like it was the Map layer that got moved. In that case, do the same fix but on the Map layer and push the left arrow.