I get bad request error whenever I access apart of questions

Question

I am using non English RTL version

The issue is whenever I select the first or the second shape of URLs in the admin panel/general setting

which I see OK beside its. like the following

1.  /123/why-do-birds-sing 
2.   /index.php/123/why-do-birds-sing 
3.   /?qa=123/why-do-birds-sing 
4.   /?qa=123&qa_1=why-do-birds-sing 
5.   /index.php?qa=123&qa_1=why-do-birds-sing

 

some of the questions or some of pages show the following error

Bad Request

Your browser sent a request that this server could not understand.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

 

Please help me to resolve it