Half the circle gone?

My screen shows half of my circle completely empty no strike tower no supply drops no events and it just seems like a bug

I have a reservoir covering a third of mine, never get anything on that side, even dinosaurs at the waters edge.

On occasion, the supply drops move or reshuffle. Sometimes they move in your favor, sometimes not. I have a bit wooded area across from me so I have a large area without drops so on my account with the blue circle, I get as little as 3 and as much as 7 when they move. I also have a couple permi-drops that are always there in every shuffle which is nice, I will always have at least 2 in range.

It has been happening for 2 to 3 months