Issues Upgrading and changing PHP version as necessary

I am attempting to upgrade from 7.12.1 to 7.13.1 with the appropriate upgrade before going to 8. In the wizard, it gives me an error that PHP version is incompatible at 7.3.3. When I change my PHP version to 7.4, I am able to login to SuiteCRM but no main page data shows. Trying to get back into the Admin info it does the same. Only the headers are seen. Any suggestions on how to remedy this? Thanks.