Ok so i've been playing a lot lately and i've been working on a few perks that are currently partially unlocked.

Serveral perks rank up through 100, 250 (200?) and then 500 kills.

However as of today many of my perks that i had around 400 ish kills on have been set back to 91 (same number on many) yet they still give me the perk rank for the higher killcount.
(ex. 20% higher firing rate on Rapid fire while on 91 kills when it requires 200+ kills for that bonus)

Is this an known issue?

Thx.