Notice in my Pack inventory ...

... I have 9 Spruce Wood. I'll move them into my normal inventory ...

... split it ...

... shift-click the 4 back into the Pack ...

... then shift-click the 5 into the Pack.

Notice the count is at 4 still.

Something funky with the Pack counting.

Thanks for reporting this. Found the culprit and going to release a fixed version soon.

You're responsiveness is amazing. Thank you!

Thanks, somehow I get pretty motivated to work on stuff when I see issues reported, because that not only means that people have added mod to pack, but that they actually use it.
And I really want to motivate people to log issues hence fixing those as fast as possible.