Percentage of completion in SDL Trados 2021

The percentage of completion shown in the lower right corner of the screen in the Editor Mode keeps giving inaccurate figures.

For instance, at the moment, I see the following:

Not translated segments: -7.90%

Draft segments: 5.99%

Translated segments: 101.91%

What on earth is that? :) And that happens for every single translation project I do....

My method of working and all the programme settings are exactly the same as in Trados 2017. I've never had this problem with the previous version. 

It prevents me from accurately tracking the progress of projects. Can this be fixed somehow?