Danny .. saw the same thing, those platforms are not reliable, not sure why, could be the "altitude bug" P3D has, not sure. Changed them all out to concrete pads. They seem all ok now. Also changed the PP10 ADEX (Airport) completely, now has a working dock and taxiway to runway. The "midway" helipad is there and can be used, but it is not part of the "airport". Check it out and see what you think. The changes are "up" on the new zip at the web page.
Doug