I recently tiled our bathroom. The toilet has now been back in place for a couple of weeks and roughly a linear inch of grout coming from under the toilet remains dark colored. It's very, very slightly damp. Is this clearly a case of the toilet not having being put back in properly. I used a wax ring bought at Lowes but the plastic shaft (the bit that should fit into the flange), was at least an inch shorter than the one I had taken off. Nevertheless, I still thought it went in far enough. My amateur guess is, that on each flush, water could be splashing into the pipe and a tiny amount of it splashes back up between the flange shaft and the wax ring shaft.
Does this appear likely? If so, where can I get a wax seal with a longer plastic shaft - or do I just have to glue a piece of PVC pipe to it?
Thanks.