Hello.
There should only be a single active template. When you go to the Design > Layouts page, your active theme should already be selected by default. Please verify whether you have multiple stores with the same URL (https://abantecart.atlassian.net/wiki/spaces/AD/pages/8028306/Multi-store).

Have you made any recent changes to your hosting?

Hello.
What is the order status you set in the PayPal module for the Success & captured and Success & not captured?
What is your Transaction Method?

Hello.
Did you see any errors in the AbanteCart error log?

Hello,
It seems that you have debug mode on, which causes a lot of logs to appear. To turn it off, go to Admin → System → Settings → System and change Debug Level: to Level 1 or Level 0. Debug mode should not be On in production.

Then, clear your AbanteCart error log.

Also, please share your AbanteCart error and tell me if this is a fresh installation or an upgrade from an older version.

Hello
Please explain what you are trying to do and what problem you are facing. Also, please send us a screenshot of the issue if possible.

Hello.

Layouts are stored in database https://abantecart.atlassian.net/wiki/spaces/AD/pages/9732104/Manage+Product+Layout
Blocks usually in theme folder like extensions/theme_name/storefront/view/theme_name/template/ directory

Hello

The purchases may come later to GA (about one day) but you can use google tool https://tagassistant.google.com/ to see what is sent after you complete the order

Hello.
If your theme is not BS5 it may require update