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.
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.
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Seen this happening, however, the problem seems to be the "mousover" about "volume" it seems to take from inventory depending on slot it is in the target.
This difference also happens when splitting stacks in inventory, it sometimes displays the volume from a stack in inventory, when pointing to a stack in a chest.
But as shown this does not happen in all cases, seems like the last stack moved counts, but not sure.