Why did d_quick checkout suddenly disappear?

Question

opencart

There is a site d-toys.store/index.php?route=checkout/checkout
If you buy and go to the design, then a beautiful design was opened which was made using the plugin. Now it is suddenly gone, empty blocks. I did not do anything. I rolled back on the hosting a week ago, when everything was ok, but it did not help.
I removed the plugin, hoping that the standard design would work, but no. Standard shaggies appear but the first one, which always opens, is now closed and also empty. In the console, the only error related to owl carousel