Hi there!
Sorry for the inconvenience.
Would you please contact your dtregister and eShop extension providers about it? We have updated our Helix Ultimate framework as well as template to adapt the new Joomla 4. So, as you can understand it's about a huge transformation. We have moved from bootstrap 4 to bootstrap 5, updated fontawesome version, Scripts & stylesheets are loading with deferring and many more.
Kindly, contact your extension provider about all the changes towards this new updated era. They may help you with this.
However, you can try to roll back to your last working version of the site. But keeping a full site backup is always important. You can revert to the older version either.
Best Regards