I've just discovered a similar problem, but it's not just themes. There's a whole bunch of stuff that I can see my purchase receipts for, but the content itself is just gone. Not available to download from my purchase history, doesn't come up if I search for it using the exact title, just *poof* like it never existed! I have always found it frustrating that Samsung locks you into their store to be able to change these things, rather than purchasing items in google play and them then being stored on the device itself. Even if content is removed from the play store entirely, you still retain ownership of it that way. Now I'm wondering how much money I've just poured down the drain on content I've already lost or will lose with future updates!
1st make sure in settings you have "show Themes App on home page" turned ON, and DONT look in the GALEXY STORE for purchases, has to be Theme app.
Idk why you are having this and that's terrible.
When I was on beta, I could ONLY SEE updated to 14 themes..
But can always see everything in purchased and receipts...
Now you CAN NOT SEE on any designers page themes,walls, icons, UNLESS there updated...
Some designers still have blank or very little on there pages..the process of being approved can take forever..
And in purchased item's you can still download anything BUT IF NO UPDATED TO 14 YET it will warn you that all parts might not work, however, I've still downloaded and they work fine...
Unless I'm not realizing I'm missing themes,then I just follow the steps..I took screen shots for anyone who doesn't know..
Also, every designer has an email Addy, now I know you can't email everyone but maybe,as I have email one and ask them is there something I'm not seeing, doing, where's my theme.
Because like I said in purchased items, even if there not updated they should be there.
I hope this helps someone..