A TFT BUG(?)

I've had this problem twice when trying to sell champions that are in the waiting area. I did this by dragging the champion to the bottom and ended up selling champions in the last lane of my chessboard. Just wondering if anyone have had this problem before? I only started experiencing this issue til this patch.

Of course, one way to solve it is to use E instead, but can Riot somewhat fix this issue by providing, say, a "restore" function?

Thank you