Hi there! It's possible that 1Password changed its icon from one version to the next. Aurora Store doesn't always download the same version as the one you'd get on the Play Store, since Play Store does staged rollouts for apps (where a specific % of people get the new version, instead of all of them at once).
Another possible reason for the difference in icon is that you perhaps had themed icons enabled in one of those two times.
If you could provide me with a screenshot of what the two icons looked like, I can do some testing on my end and confirm that for you.