Hi,
It’s good to increase the execution time. But can you please make sure, if your server also meeting with all these requirements?
https://woocommerce.com/document/server-requirements/
If yes, then it can be a plugin/theme conflict issue with the product’s display. So you can perform a conflict test. Here is a detail article that how you can perform a plugin or theme conflict test.
https://woocommerce.com/document/how-to-test-for-conflicts/
Let me know if that helps.
Regards,
Jamil
