I still see this issue. In fact, I've copied and repeatedly pasted controls, then resized one (by dragging) and tried to use the same size numbers for the copies. The copies exhibited that behavior. I've always thought it was related to the grid size setting somehow; like you can drag it to any size, but using the property sheet might limit you to settings that align with the grid. One way to test that would be to make copies of a control as I described, drag one and use the same numbers in the copies. Find a drag size that can't be given to the copies. Then change the grid size. See if the number Access enforces for those controls can be applied to any of them, or does it now enforce some other number? If not, you could try more grid sizes and re-test. Or just live with it as do I. You are not the only one who has marveled at this behavior! If you test and discover anything, please let us know.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.