No, alot of mine do the same thing. I think it's the nature of the beast, but I do try and pick them before it rains.

Cherry tomatoes are prone to splitting. Sweet 100s seem very prone, especially when the get a surge of water when they are ripening. There are some varieties less prone to splitting.

I think there was a fairly recent thread on here that had some info about cherries and splitting. Try doing a search.