Hello
Thank you for your query. Can you try the following?
a) Disable/enable - Compile LESS to CSS in template settings
b) Clear CMS cache
c) Disable Joomla Redirect
component/plugin
d) Use database fix
At the end, you can also ask hosting support to increase PHP memory.
Also, you can try lowering your php version and check once. Newsberg template is not compatible with php 8.0 yet, we will be working on that. You can check the technical requirements once below:
https://www.joomshaper.com/documentation/joomla-templates/newsberg/technical-requirements