How do I find out why this is happening?

The following dependencies have been added to the manifest:
Feature - SUBSCRIPTIONBILLING:required

I don't know why it happens, but I've found that you can update the manifest to required="false" and it won't add it back, but it won't require it either

Yah, that's not working either. It has something to do with forms and it's really pissing me off. I can't deploy my app because it thinks it's required.

You can delete it from the manifest all together

Nope, it's automatically adding it every time before it deploys to the account.

how are you deploying? Are you explicitly saying to update the manifest with dependencies?

THANK YOU @Matt Bernstein The IDE must have checked that box for me during one of the updates.