Hi Sorry for the issues you are having.
I took a look at your site and see the problem.
The Week View completely changes when you go to the mobile version, but your site looks like it is keeping both visible.
This is how it should look:

It looks like the stylesheet is loading, but there is some custom templates for the Events Calendar and this div is missing:
tribe-events-week
Causing the standard Week View to still show in mobile.
You may have to either remove or recheck the customizations to fix this.
Or you can add something like this to hide the week view on smaller screens:
@media only screen and (max-width: 768px) {
.tribe-events-week .tribe-events-grid {
display: none;
}
}
However, you will have to find a replace selector for tribe-events-week as it is not present in your week view.
Let me know if you have any follow up questions.
Thanks