Project-GC will automatically pick up updated coordinates you have put in the Personal Cache Note field, but it will only check them a couple of times per day unless you specifically ask for it (either via Support -> Self-support or by requesting a refresh of corrected coordinates when exporting a VGPS). If you only have updated the coordinates via the pen icon by the coordinates on the cache page Project-GC will not automatically detect this update for technical reasons, but the refresh method with the VGPS described above still works.
Since you say that you have used both methods you should be fine here, as long as you didn't update the coordinates just now. When I try mapping a bookmark list I get the caches shown at the new (corrected) location, so the function as such works. When did you update the coordinates?