TFT Force of Nature = +1 -1 unit cap

I was playing Teamfight Tactics on the Live server and do not wish to see if I can replicate this because it ruined my whole game. My field had Graves lvl 2 with a BT, Pyke, Brand, Kennen and Lissandra. The round had started so my Elemental Golem buff had been summoned in case this was what caused the bug. The Round was going I was level 5, I placed the spatula on graves on the feild, and the other spatula on top of it making Force of Nature. The round ends and I have 5/5 units. I try to fix this by removing units from the feild then adding them leveling up to get another unit slot, I make graves 3 star. None of this fixes it, I am now Level 6 with 6 unit slots. I sell the graves. I now am Level 6 with 5 unit slots until I place force of nature on a new unit making it Level 6, with FON with only 6 unit slots.