3D FlipBook - HTML Links in the PDF

Hello flip book friends, I created a PDF and linked all the links to the online shop directly in the PDF. Works perfectly with different browsers on the PC (the shop page only opens once) ..... but with the mobile phone and with the tablet the shop page always opens twice. Does anyone have an idea how I can solve the problem?

https://wetter-impruneta-terracotta.de/kataloge/katalog-kleine-toepfe/ The links to the online shop start on page 4

Thanks in advance Brigitte