Place a block in storage, move it and then add to the stack, the original spot placed will reflect the original value. The values reflected does not affect the actual capacity.
{F4467}
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Relevant description:
Mouseover when pointing on an item, often displays values from a different stack of same item, especially when pointing to a stack in a chest. (Seems to prefer inventory stack for mouseover.)
However, the displayed amount/volume (in the header of the inventory) when moving it, is correct.