Deleting manual LHTR input from historic graph

Hi. I tested the manual input for LHTR and it automatically added a new measuring point in my historic. However I want to delete it from the graph and doesn't work.

I entered the previous value, and another point was added again. I would like to just keep the first point, the one that was detected automatically.

Even if I change to auto detection, these 2 manual inputs remain in the graphic. Is there a way of deleting them, thanks.