the page you are looking for cannot be displayed because an invalid method (http verb) is being used

[Shasoosh]

405 - HTTP verb used to access this page is not allowed
the page you are looking for cannot be displayed because an invalid method (http verb) is being used

I'm getting the above error when trying to access the website via the Visual filter selector.
The visual filter selector is mandatory here due to random objects in the page after each refresh.

Any help would be appreciated.

Link to website