Being a level 17 manager, I'm able to train skills to 19 (and I think further but I didnt get to that yet) while I think it was meant to go to only 18 in my case. Also noted the same in another team of mine.
This was changed after feedback that people didn't like the individual levels being capped to their manager level. E.g. someone would keep training "Driving ability" all the time hoping to get those skills up the most and then start getting "No change" messages at their level cap. There was no variability or strategy to training when everyone was just capped to their level on all skills.
So I removed the cap on individual skills, and applied it to the overall level only. Now you could train mental up to 20 and have driving ability at 1 for example to average a level 10 driver. I also allowed anyone to continue training beyond their level cap, but restricted progress heavily once the overall level hits the manager level. It starts moving at just 1%. This was done to prevent anyone from being able to buy a heap of Tokens to train all skills up to level 20. Thanks to the 1% progress beyond the level cap, you would have to be on the Forbes 100 list to upgrade a driver all the way to level 20 while being well below level 20 yourself, keeping the game fair and players experience capped rather than Token capped.