What causes strawberries to split in the center from bottom up?

by Lori
The strawberries look like siamese twins. Connected at the top but when you hold it up & look at it you can see all inside it . The guts of the berry seem to be missing from the inside. We have had almost constant rain for at least 3wks or longer here. Heavy Rain. Everything is flooded & I suspect that is likely the root of the problem but is there anything that can be done to fix this problem? Any help or ideas appreciated.