I've had this happen a couple of times the past year. When bike is just propped up by kickstand the left fork will leak fluid. When upright on a stand it will not leak. I did the ol' film negative trick in the seal just for good measure. And then of course I don't know how much leaked out so I had to completely take off an tear down forks and re-measure fluid level again. Will not leak on stand though. Anyone else experience this? Some things just make you go hmmm.............