When I try and sort a bag with inventory tweaks it does not sort how you would expect. This is a screenshot of the contents of a bag that has been sorted using middle mouse button and the default sorting button on the right. As you can see there are still stacks of white glazed terracotta throughout the bag not in 1 sorted line.

Forge: 14.23.5.2855
QuantumStorage: 4.7.0
InventoryTweaks: 1.64+dev.151

I have tried multiple versions of both mods and I havnt found a combination that the sorting is normal.

If this issue persists in the latest version of minecraft it will be looked at. However 1.12.2 will not be looked at anymore. QS had 2 complete rewrites since 1.12.2

Damn, shame as 1.12 is played a lot but ¯_(ツ)_/¯