Help – Your Plugin is breaking my website

Hi, your Contact Form on this link:’ https://wclovers.com/woocommerce-multivendor-customization/ ‘ is not working, so wanted to ask for an investigation into why your plugin is breaking my website here.

I have built a staging website to showcase the problem.
Please have a look:

With WCFM installed – https://collabapp.in/staging-collab/members/
Without WCFM – https://collabapp.in/members/

Currently, it is breaking only one page’s Custom CSS, but last time I installed the plugin… a lot of other pages started showing 404 error over time. Could you please check what is causing the problem?

Thanks.

The page I need help with: [log in to see the link]