Thank you for your post.
I am able to replicate the issue with FileMaker Pro 14.0.1 under both Mac OS X 10.10.4 and Windows 7. In essence, a script cannot be reordered while there is an active search.
I have sent your post along with my findings to our Development and Testing departments for review. When I receive any feedback, I will let you know.
An entry in the Known Bugs List has been linked to this Issue Report. Any Comments/Questions/Suggested Corrections should be posted here or in a new thread. Please do not post such comments to the Known Bugs List thread.