Videos/Startrails not shown under Chrome

[do2rah]

I have a local allsky webpage running on rpi. When i browse to that page the live view is displayed correctly. When i move to Videos or Startrails Chrome (on windows and android) displays me an empty page (black background and back-button are there) with no thumbnails. If i use firefox or edge instead (or samsung browser on mobile) the thumbnails are shown correctly (and you can play the videos, too). In the inspection mode of chrome it seems that the php skript only returns that empty page with no thumbnails and links to the videos. But why should the skript behave different on other browsers?
Best regards,
Andreas