Carrier restrictions not working - all payment methods is shown every time

[Holohugo]

Im using PS 1.7.6.7 and i can't restrict certain payment methods to carriers. I set everything up at the bottom of the payment > configuration page, but the effect is not applied, all payment methods is shown with all carriers. 

I cleared the cache. I tried to run debug mode. I disabled all overrides and modules. No matter what i do, it shows all methods. Kindly asking you for help, if you know where to look at. Thank you. Im on PHP 7.2.

[Holohugo]

Problem persist, we tried everything we found online. We cant restrict payment method to anything. They just show all the time. I cant even restrict them to certain countries and crrencies. Please, is there anyone who could help?

[Holohugo]

Tried all version of PHP from 5.6 to 7.4
Upgraded PS to latest version 1.7.7.6

Tried to disable all overirides and modules.

Nothing work. I cant restrict payment methods at all by nothing. Not by country, not by currency, not by group and not by carrier. I would really appreciate any help with this. Thank you.

[ComGrafPL]

Did you set countries right?

Send me details on private. I could look into it if you need.

[mkinternet]

I have same problem with  PS 1.7.8.6. How i have to set countries right ComGrafPL?

[psy_ch]

the solution to this problem is MOST PROBABLY the php setting max_input_vars! Set it to 20'000! This solved the problem for me immediately