/Remake Demotion???

So i played ranked earlier today and there was an afk in my game. Me and my team deiced to /remake and sit base so we would get 5 man dove and first blooded. After the remake was initiated we all go back to the end game screen, and i got demoted. I was at gold iv with 0 lp, i thought we werent supposed to lose lp. I wasn't que up with the afk in question or neither were my teammates. but we were all hit with the lp loss for some reason. As you can see in the photo the remake did go though and I was demoted.