Event for KTR 08 Crates

I played yesterday. In this morning i entered the site to see exatly, how much hours i have, i clicked „check”, You have played 4 hours and 0 minutes and have won 2 KTR-08 Crates. ....

But... WHY? I thaugh it will be 2 crates for 2 hours, 3 crates for 3 hours, 5 crates for 5 hours and 10 crates for 10 hours.

Its a bug or i understant this wrong?