Online store packs disappear

[AminoSims]

Hello. I've some issues regarding online store in the game. Some packs appear and it shows that they are available for 3 days but when I exit the game and re-enter, the pack is gone. Sometimes it is replaced with another pack and sometimes it disappears altogether.
*This happens to the packs with 3 days time limit only.

What can I do to make the store more stable? I've tried rebooting, uninstalling and reinstalling and force closing the app.