doubles effects

When I do an edit with HDR Efex Pro2, I do the edit, click OK, says it’s saving, and the correct edit shows. Then it says loading, preparing, (something else), preparing HDR, saving, and the photograph opens again but it’s doubled what it’s supposed to be. I click Edit, Undo Apply Layer Mask, Undo Fill, and then the photograph is what the correct edit is supposed to be. I have to do this every time. It’s not a hard to do, because it’s only 2 clicks, but it’s kind of a pain. Why does it double what it’s supposed to be?