I suspect the issue lies in the web template and potentially if entity permissions are turned on or off on the entity list record. It all becomes a tangled web (ha! pun) real fast.
When you create a web page, you choose a page template. A page template is essentially a "pointer" to a web template or an aspx page.
This structure is mostly because of legacy from the days before web templates.
So if you change the page template, you will change what web template is used or might even point to a legacy aspx page.
An entity list can be made visible in three ways:
When adding an entity list (either via the Portal studio or creating it via the portal management app) there is checkbox on whether to apply entity permissions or not.
I am wondering if you are seeing an entity list on one page that has this shut off and when you switch out page templates, it shows another entity list with entity permissions turned on.
I know this was a lot to unpack, but hopefully provides a bit of insight.
The content available on MS Learn could provide some insight on how this is all wired together.
------------------------------Nick DoelmanMicrosoft MVPPower Platform/Dynamics 365 SpecialistNick Doelman Co.Ottawa------------------------------
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