a number is constantly copied to clipboard

Notice that something very strange and annoying has been going on since yesterday.

Constantly a number copied appears in the clipboard and when I delete it, in seconds it reappears, I delete it and again it appears, pay no attention to the beginning, But now it is very annoying because when you copy something, it immediately gets like 1st place and what I copy from 2 and when you paste it, it just appears that strange number...

Delete all the Swift keyboard settings that I always use, and nothing reappears, I use clipper+ and delete it too and nothing...

Hi,welcome!
So you use stock keyboard that has the issue the other 2 you tried no issue, correct?

Welcome to Android Central! Do you only have one keyboard app installed? Are you talking about Swiftkey, and if so, is that the stock keyboard on the phone?