When I built a pill

HEy everyone I just finished a game with sayian and it was a really good game any way he was down to one pill so i clicked to place a pill in front of his pill as a block and when my pill was layed sayians pill dissapered and it, i had it............. What up with that, this is not the first time it has happened, so I was wondering what did happen, I know it was a bugg , but it is possible to fix. :twisted: