Black Circled Maps & Loading/Rendering transparency

Level 1 and 2 maps have black circles on them when I log in. If I fill in the map then it is fine until another player or I log in again. This happens to my level 1 and 2 maps but not my level 3 and 4 maps. 

 

Second issue is when I log in the map is transparent and the blocks become not transparent as it loads. Not sure if this should happen but did not before.