Ok, I experience something strange. Whenever I lookup an activity on Garmin Connect Web (or mobile) I see the track and the colours are based on the speed/tempo. Today I even made a screenshot of an acitvity which displays the speed, but somehow now the track changed to only red. I don't know what I did, but for swimming activities it is a red line, but other activities still show the speed coloured track. When I try to change the settings in the other activities I can see speed is chosen to display, but for swimming activities this option somehow is gone.
Anyone knows what's going on here?
