Tempo extract from audio

after extracting a tempo map i am getting a new tempo for each 1/4 beat.
at some location because of a ritardando the map tempo jumps and couonts a kind of double tempo for 1 beat. musically i would need to delete one of the tempo markers and edit the timing in that spot. but i can not get red of that extra tempo marker. how can i solve that?

basically deleting tempo marker @br189 and edit marker @br188 to half the tempo