Hey Lightning gurus, I am wondering if any of you have had this problem before and can help me find the root of my problem...

I am getting an issue both sandboxes and scratch orgs when trying to deploy my source. They have Lightning enabled before I deploy, but then I deploy/push my source to the environment and Lightning is disabled and I have to enable it again (for the record, we are using @Salesforce DX  to deploy). I have tried enabling it in a scratch org and pulling the changes, but no changes are found. I assume there is a setting in my source code that is disabling it, but for the life of me, I cannot find it.

Can anyone tell me where I can find this setting so the Lightning stays enabled after pushing my source?

Thanks in advance!