Ah, that actually is OK: Collate means that copies are kept "together", I mean, if collate is active and you are printing 3 pages 2 copies, you are supposed to get 1 1 2 2 3 3, while with collate 'off', you get 1 2 3 1 2 3. Which IMO is excactly what the loop does.

Anyway, that doubling of copies is (for me) long existing bug, it has rather something to do with some misunderstanding of printer driver and windows print dialog. It affects only some printers and some drivers. Which reminds me that I have not tried with my current win8.1 and current printer, time to investigate this bug again...