There are several problems displaying units of measure in Schedules that never seem to get fixed. Make a Door into a Cased Opening by selecting the Empty Door Leaf and see how the dimension of the leaf is scheduled - and there is no leaf ! The display of leaf thickness in that case is controlled by Calculation Unit Rules.
You are not doing anything wrong, this is a bug, we are working on fixing it. It does not look nice, but luckily the value is correct, so until the fix this shouldn't cause imprecision issues.
Also, the problem Steve mentioned is a library issue that seems to be specific to the doors in the US Library. I have tried with INT doors as well, and it worked fine. I have let the developers know about this issue, hopefully it will be fixed.
Daniel Alexander Kovacs
Professional Services Consultant
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