It may be that someone has done a bevel set with a large amount of tape if there is clearance between the edge and the stone, either that or... When was the last time you lapped the stone? Before I start honing a razor I lay it on a flat piece of glass or a granite slab that I use for wet/dry lapping. The reason I do that is to get an idea of what I will have to deal with on a stone, if the razor has a problem I want to know ahead of time. I always lap my hones prior to doing any razor work to ensure that I have as flat a work surface as I can get but I never use the hone as a "straight edge" for the razor, that is what the glass is for.