Ballet Barre Body Skill Bug

I have a Sim who usually works out with the TV and had 5ish body skill. I bought her a ballet barre and had her use it, within SECONDS I was flooded with skill point notifications and her body skill was maxed out.

She's in the Dance career, has a Drama degree, and has medium enthusiasm for Music and Dance. Surely this isn't the intended behaviour of the barre and is a bug?