I have added ground polys 1 thru 4 on runways at TAPA per the attached FSX screen shot. Polys 1 thru 3 disappear when zoomed in but 4 does not. The airport, background and runways are all shown to be at 60 ft elevation in ADE. The polys are at layer 23 or 24 with lines at layer 24. I would appreciate an explanation if one is available.
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