SSL VPN web mode - unsufficient website

Hi,

I am a newbie here. We have a Fortigate 501e, with the v6.2.1 firmware.

I would like to setup an SSL VPN for students, I created webmode for them, where a I put some bookmark with HTTP/S links on them. It is really strange, if I log in, and try to browse via the bookmark, it displays for example with missing pictures, buttons, etc. especially I cannot search for any books, it looks like this, it doesn't work.

If I click on the "Keresés", the blue button, it doesn't work at all.

I hope you can help.

Sincerely,

Roland Szabó