In recent versions, there was an error displaying large polygonal hotspots. In the flash player everything is displayed as it should, but on html5 an error appears and some of the points are shifted in the mirror direction.
https://sferitus.com/?xml=fly/stadium/tour.xml
Code
<hotspot name="spot1"><point ath="41.854632" atv="17.702521" /><point ath="150.940513" atv="11.919116" /><point ath="153.762042" atv="12.254591" /><point ath="46.729459" atv="21.673211" /><point ath="39.148851" atv="19.513441" /><point ath="-7.095752" atv="8.511058" /><point ath="-4.324017" atv="8.109533" /></hotspot>