Hello,
1/ Try to disable all the third-party plugins (including cache plugins), that do not come bundled with XStore https://xstore.helpscoutdocs.com/article/36-included-plugins , clear cache of browser, and check then. Maybe one of the additional plugins is a reason for the problem.
If this is not the fault of plugins, provide temporary FTP access, we will check it more deeply.
2/ Theme Options > WooCommerce > Shop > Shop page layout > Включить Липкую Боковую Панель > Off
Regards