Need help with my comp.

So recently I was placed at a rank of LEM, it seemed cool and all but now it is just a nightmare. I played my first game and won it, was top fragging and everything seemed ok, only strange thing was is that no one was ranked. I brushed it off as maybe it didn't show. I play my next game with a friend who was master guardian 1 just for fun, we lose 16-8 I top fragged in that game too but we were against other mg's which makes sense as that was my friends rank. But then right after the game I derank... I don't know why it would happen, although I lost 1 game in a lower rank I wouldn't think that is enough to do a drop in a rank. I didn't get too mad as its not a huge deal so I play another game, we go on and win but it turns out all the kids were silver elite masters or gold nova 1. This is where it got way to weird as why would the game drop me all the way down there even though I am not allowed to que with them cause of skill difference. This was super annoying but I decided too play another, I had to leave sadly cause 3 people qued together to troll and derank, but once again all these guys were silver elite masters and gold nova 1's.

My question is regarding what is happening, it wouldn't make sense that the game would place me so high just to have me never play a single game with anyone above mg 1-2. And then too further drop me down to silvers which In all my placements when I saw the ranks at the end of either my friends or people I played with they were at least master guardian, and to top frag the game must know that I can handle myself up there. SO if anyone knows what to do regarding this as I don't want to play these games with silver trolls or just silvers themselves it would be very helpful. I would hate for the game to drop me so low just to make me have to rank up all the way again, since if it wanted to do that it should have done it since the beginning thanks!

Edit: Make the DMG now after the game I left finally ended, this is really fun! Its right now at a lose a game insta derank and its placing me at silver so im screwed.