I'm having this issue to where I can snap to one object and the grid and snapping is fine, but when I try to snap the grid to another object, the snap goes haywire and ghost snaps to a "ghost objects" and starts moving cross the map. Turns out it was an addon "G-water" that was causing it. Not sure if anyone else has come across this issue, but figured might as well make it public as to help anyone that may have experienced this issue. I'm going to look further into "G-water" to see if there is an option in the settings I can turn off to see if I can keep the addon so they both can work together. Maybe it has to do with the "set to your aim direction" in the G-water menu under "quick control?" I don't know, I'm not a programmer. Figured I should report this bug and make it known.