I have come across a website where 1Password is saving the formatting applied to a field when saving the login, which resulted in a failure to fill correctly.
As you enter a number into the mobile number field, it is formatted with brackets and spaces, then when attempting to fill the login details, all that appeared was (
I fixed the entry in 1Password afterwards, which allowed it to fill correctly, but something to keep in mind anyway
I'll update this thred with the versions of the app and extension later today.
Interestingly, I just tried in 1PasswordX (1.14.3) in Chrome, and it saved the formatting and was able to fill correctly.
1Password Version: Not Provided
Extension Version: Not Provided
OS Version: Not Provided
Sync Type: Not Provided