Batch processing pics in automatic mode

I have the following problem:

I want to have all chosen pictures to be automatically processed (Button "autom." in the base functions in german, I hope its the same in english). I activate the autom. sync. function and press the "autom." button. Lightroom then processes all pictures, but when I click through the images they are just processed "randomly".. they are too dark or too bright and the "autom." button is still active though usually when you click it it gets deactivated. When I click it then the picture gets processed correctly.

Am I doing something wrong or is there another way to batch process automatically?

Thanks a lot, Jan