I reported this problem in 1.11, I am in the 1.13.0.17 beta and I am having the same problem. A Skin pack that I have purchased is still locked, if I try to equip the skin from the pack, I am defaulted to Steve or Alex. I am having this problem with:
Random Pack by PixelHeads
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Thank you for your report!
I'm so sorry about the delayed response (and a less than ideal one at that). Unfortunately though we are unable to assist with this issue.
As this is an issue with your account or billing, you will need to contact Mojang Customer Support directly who have access to the tools needed to look into this for you.
Best of luck and Happy Minecrafting!
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Mine is doing the same thing