Items not flowing over hopper consistantly in sorter.

I have a classic sorter using hoppers with a water trough system to move items through the sorter. The latest update seems to have broken the reliability of the sorter as I am losing items. The sorter was working before the update in as I wouldn't lose items.

What I have noticed was that the hoppers now trap items as they pass over it. I've seen the items as it float by a hopper get stuck, then as other items of the same type float by they get grouped or bundled with the first one