How do I correct a problem with the clipboard?

I accidentally clicked the “conditional formatting” button on my toolbar.
Since then, every time I try to use “cut-and-paste,” Writer pastes whatever I cut two times ago. So, I have to cut, paste, undo until whatever I cut is back where it began, then cut and paste again.
How can I restore normal function so that it pastes the last text I cut instead of having to repeat this process?

An interesting problem. In the past the symptoms have been blamed variously on poorly designed clipboard managers, Windows 10, LibreOffice, a corrupted user profile, and others that I can’t recall. I wonder if conditional formatting has been the cause of all the problems, all along.