So i unfortunately have no idea what the issue is
but alternatively, just in case you hadn't already discovered this, if you hold down Q your item wheels should appear. You can then hold the left or right mouse button while continuing to hold Q, and drag the mouse in the direction of the item you wish to select. I personally have found great use in this, as being able to select specific items for each hand while mining, etc. rapidly became an issue otherwise.
Hopefully this helps! if not, hopefully someone who actually knows what they are talking about shows up! sorry!