@BB-Perpete: Good to know that it is only a measurement and not impacts anything. :)
So the drop reflects that the older players skill drop into a lower salary at a bigger rate than the salary increase on my trainees, right.
@Boule: Ah, great link! I will use the afternoon to try and understand it, and try to get a better grasp on it :) And see if my assumption above is correct.
Thank you for all the replies, it has been very helpful. I have never been able to see when my players are getting close to the cap before. Perhaps I can waste less time training capped players now.