We experience this too - just haven't got around to reporting it. if you have the time can you add a MDL tracker item with a screenshot. When I have some time (next month?) I will see if I can sneak a bugfix into other moodle networking W/R's we raise with our Moodle partner - if it hasn't been solved by someone else in the meantime.
Moodle networking (MNet)
Course report changes selection
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