The right hand keys to type the master password locked up and/or were unable to be deleted when I attempted to open 1password. I found the workaround to close up and restart. Just reporting that I have been having this issue, too.
@JanetC does this happen every time, or just the one time. Also, if you let it sit for a minute, does it "fix itself?"
Here is a really long thread about this iOS bug.
Thanks for chiming in with that, @hawkmoth!