Mikrotik Hotspot Splash page

Hello MT guys.

i have created hotspot on MikroTik RB951G-2HnD routerboard. A few days ago I could see my custom login page and also successfully connected to internet, but today suddenly something went wrong. When I click the “connect to Internet” button on my splash page, it redirects back to the same page. Why is this happening?

*Freeradius is installed on the server

You can see in the attached files config file of MT and my index.php of login page.
config-3.rsc.txt (2.47 KB)