marinad327 Does this happen with no mods or custom content, as in, when you move the Mods folder to the desktop? That would be the first test. I understand that this is intermittent and therefore difficult to test, but you could try with a clean user folder. The second time you launch, you should get pop-ups for every single pack you own.
To test in a clean folder, move or rename the existing Sims 4 folder in Documents > Electronic Arts. This will prevent the game from reading your existing user data, including saves, mods, and the flag that you've already seen the pack-related pop-ups. When you want to go back to using your content, trash the new Sims 4 folder and restore the original.
Another possible cause, if this turns out not to be mod-related, is an overlay that's running alongside the game. You can disable the Steam and EA App in-game overlays, or just not open Steam if you don't need it to play; Discord comes with an overlay as well.