BUG - Unable to sell champ on bench

I recently played a ranked game where I had two 1 star Nidalees on the bench and I selected one of them and moved it to swap places with the other benched Nidalee but they then combined into an enemy one 1 star Nidalee that then had a red health bar and could not be sold.

I hope this makes sense!

off-topic - overall enjoying TFT except that players don't receive the same amount of items which just adds more RNG to the game.

Cheers TheLastSnow