Draw: granularity of dragging objects with mouse


I am using Ubuntu (16.04) and LibreOffice (5.2).
When moving a Draw Object with the mouse I have a very coarse (and random) granularity. If I press the shift button, then dragging works as expected.

The problem only occurs with LibreOffice (in Inkscape for example everything works as expected).

Thanks for any hint you may have!

Maybe you need a better adjust for grid options on Menu/Tools/Options/LibreOffice Draw/Grid - Grid