I reach a marriage record. Neither the bride nor the groom are already in the database; but the groom's parents are; along with numerous children. When I scroll down and add a child, with that groom's information, and hit OK, the fame family shows up, with the wrong child pre-selected. I have increassed the font size for easier reading, and it highlights the last child shown instead of the last child on the list. This greatly increases the risk that I might add the spouse to the wrong one.
Specifically, I increased the font size and the first five children show. The fifth is highlighted. Maybe you have this problem anyway, but with so many more children showing on the standard font, it does not manifest this problem as often. While you are working on this, please also consider automatic sorting of children by birth date.