Need help with tempo changes!

Hi, I have an issue with tempo changes in the tempo track editor. I used to be able to select a tempo mark (ie 140bpm) and copy/paste it to another part of the song keeping the same tempo.
Now, whenever a copy/paste a tempo mark, the new tempo is the one of that part of the song, so I have to change it manually. This wasn’t an issue before, Musta have been sth I changed but not sure how it can be reversed.

Hope you can give me a hand.