NOP 4.0 Problem with product positions...

Hi!
we have nopcommerce 4.0 and strange problem.

We change in product "category position". All is ok. but for some reasone… product is not move "back". Product with postion 190... is before product with position 2.


Can someone check is this only our problem? or something not working?

I think problem is with grouped products. Just check single and it's ok.

Anyone? we actual lost control what we show our clients. At first position are our worst products...
Nopcomerce stop suport mange prudct by positions? or why this don't work?