If your puzzle packs are missing from the collection page, please check the My Packs category in the Puzzle shop:
1) go to the Puzzle Shop
2) press the Categories button in the bottom left corner
3) choose My Packs
4) you need to find the packs on the list under the Restore purchases button
5) tap the Download/Restore button on the packs
If your packs are not showing in My Packs, please make sure that you are logged in to the app with the same details you used for registration. Please follow the link to learn more: https://androidpuzzlessupport.zendesk.com/hc/en-us/articles/6418593069329-How-to-check-if-I-am-logged-in-to-the-app-
After that, please check if the packs appeared in My Packs.