Problems with shape keys

Hallo guys,
ich have experienced a problem with shape keys. I have used shape keys to correct the deformation of my mesh during animation. But than I have changed the base mesh just a little bit and now the shape keys don’t do their job anymore.

Can someone help?

It’s just not a good idea to make base mesh changes after making shapekeys. Especially a corrective shapekey, the mesh should be completed and weighted, no more edits. Remake your shapekeys.