Indeed I missed the fact that the 3.5 stars coach is also working as sports scientist, my bad! He's on 4.5 stars after renewing a contract without sports scientist as secondary job.
I didn't expect Barcelona to have some staff working on 2 jobs, and also even forgot it was a thing since I never use it.
Thanks for the input
Would be worth having a small feedback/tooltip on this training section to keep track on wasted stars