Hi There,
I have edited your original post to move sensitive information inside a secure note. Please note to not share those information publicly. It is now recommended to update those credentials.
When I checked your site I don’t see any error. The functionality of a third party plugin is unfortunately outside the scope of our support. Regarding the long description it can be enable on Theme Options > Woocommerce > Single Product > Description Tab
When I check, that option is missing on your Theme Options. You could try testing for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
For the sidebar, again on Theme Options > Layout and Design > Content Layout : This is set correctly and by default should have display sidebar. Check again after plugin conflict.
Let us know how it goes!