Good morning @MaRu0610, thanks for the update about using version 7. I happy to hear you were able to resolve this password strength issue after updating to version 8! Great news!
With regard to your new issue with 1Password in the browser, can you right click the 1Password icon > Settings and scroll down to Autofill and check that Show Autofill on Field Focus is enabled. If not, enable it and completely close and restart the browser and let us know if this helps.
As next step, does removing the extension and reinstalling it help at all. You can download a fresh copy of the extension here: 1Password in the browser
Let us know how this goes!