one lifter bleeds down. Any thoughts

Yes I did for a short distance. About 4 miles total. It was at low rpm also. Never opened it up or exceeded 40-45 mph. When I was blueprinting the engine I measured the outer spring pressure seperately from the inners and it measured 80 lbs. seat pressure and 230 open at .500 lift. Since the high perf. Mopar single springs I took off measured 85 seat and 260 open I didn't think I would do any damage if I didn't get on it.

Why do you ask?