Moin @ebilff,
it’s our never ending story and you will find different posts here in the forum at different places.
Pls. be so kind as to have a look at page 53 of the manual (user guide for DENON OS / gear) theme: “Beat Grid Editing” or in general page 37 of the manual (user guide for ENGINE DJ / Desktop program) theme “Beat Grid”.
I hope, these two hints will help you a little, but pls. be aware it takes some skillness to handle this item.
Brgds from HAM BeatMaster
here is one example in this matter and pls. feel free, to vote for it 
https://community.enginedj.com/t/flexible-beatgrid-ability-to-set-a-manual-downbeat/36984/54
or in addition:
https://community.enginedj.com/t/the-beatgrids-are-mostly-out-of-whack/63193/1