One of my Rics has been normal and lying flat and coverng its plug for months and then about a week ago, it started lifting up at the edges and kind of looking like a bowl. There seems to be some type of rubble or growth under it where it is lifting up the highest, but I think it may just be the original rubble it was glued to the plug with. It looks healthy to me other than the fact that it is standing up all the time. Any ideas what it is doing and should I worry about it or move it? Thanks.