Tilemap Glitching

I have googled and I have google and I can't find anything. My tile map is seriously acting up and I have no clue how to fix it. So it isn't the white lines stuff that's fixed with bleeding. This is what's happening:

1) Random tiles appearing (I will place a tile on the left side and three maybe four random tiles will appear elsewhere.) Happens at random, in random amounts. Sometimes a tile will decided to change what tile it wants to be.

Exhibt A: All this tiles (except background) appeared at random... and I cannot remove them.

2) Sometimes, I will be trying to erase (in prefab mode) and then everything sort of glitches and vanishes and I have to place a few random tiles to get it back. Then I try to erase again and bam... its on repeat.

I do have three level prefabs (one for each scene) all aptly named. So I'm lost as to what the issue might be... last thing I want to do it have to delete my entire level and re-do it all.

Thanks in advance.