MaceyNeil: The clockwork owl quest magical item reward that allows you to move 'up to' the rolled amount.
There are about 25 different threads on the subject on the Steam Bug forum about this. The devs were made aware of the issue the day the patch that broke all the "Move up to" effects launched and they are working on a patch.
And unless Luna has bugged out as well, you need to activate her (double click in the usable items area) to select the number for your reroll instead of rerolling like usual. This is technically not what should happen, but that's how she's been working ever since The City was released on Steam & mobile.