Creep Score Bug

Hi, I've been getting a weird bug in some of my games where a portion of my creep score randomly disappears. For example, I checked my creep score and it was around 250, and then I checked it again a minute later and it suddenly was less than 220. I kept farming a bit and then died with 240-ish cs, and it jumped up to 270. When we lost the game I sat on 362 last hits, but in the post game lobby it said (and still does) that I had 307 cs.

It doesn't seem to affect my gold gain, but it's incredibly annoying to not have a stable number of your creep score in-and-out of game.