I tried it just now and see the same behavior. Collections created on the website are shown last when sorted by title on my PW2 running 5.8.7 firmware. I tried a restart and that didn't help. They do sort correctly in the Kindle for Android and Kindle for iOS apps.
ETA: I did some more testing and found a work-around for the problem. The "Rename collection" function on the website appears to work properly. I was able to create new collections on the website with a dummy name and then rename them to the proper name using the website and they sorted properly on my kindle.
Last edited by jhowell; 12-24-2016 at 09:31 AM.
Reason: Add info
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