Negative experience? [Alpha 7]

[Valdemar FIN]

I have noticed that whenever my skill 19 (his skills have actually reverted from ~200000 to ~195000) cook cooks meals, his experience goes up the normal amount, but after that it goes down slightly more or less the normal amount.
Similar thing is happening with shooting skill, it appears whenever character shoots or hits his exp goes up, but when he misses his exp goes down.

Is this a mechanic that I have not heard of or is it a bug?

[daft73]

There is a slow drop when not using said skill. It is not a bug though..intended.

[Valdemar FIN]

Skill rust is something I expected, but skill rusting faster than it's building up, for example, from constant cooking may not be intended.