Subdomain problem

Hi,

I have a problem after update to 2.7 version.

I used a subdomain here: spirit.q9-gaming.com
Before i used subdomain, i use the original link like https://www.q9-gaming.com/spirit to post my blog link on others site.

Now, after update, the link https://www.q9-gaming.com/spirit is not worked anymore (it worked fine b4).

Ex:

https://www.q9-gaming.com/spirit/?p=58 is this https://spirit.q9-gaming.com/huong-dan-tao-bot

And b4, i connect to https://www.q9-gaming.com/spirit/?p=58, it will go to https://spirit.q9-gaming.com/huong-dan-tao-bot

But now, it’s going to be page not found ??

Hope someone can help.

Regards & thanks.

P.S: .htaccess file and pernament links still the old b4 updated.