No matches found or no lookup performed

There are posts from people about matches not being found in TMs. My problem is slightly different. I get matches from the TMs I have added in the project settings. But I get the message "no matches found or no lookup performed" for segments that recur in the document. So it seems like the Project TM isn't working. Very frustrating because it defeats the main object of using a CAT tool!

Can anyone help? Thank you.