Hey Ami,
I’d love to help out however I can. 🙂
Since everything is working with Twenty-Fifteen, I’d suggest reaching out to your theme developer for support with this issue, as we, unfortunately, can’t support theme conflicts on this forum.
We build our plugins to be compatible with each other, WordPress core’s functionality, and the default WordPress themes, as it would be logistically impossible to test with all theme and plugin configurations within the WP ecosystem. As such, this forum is reserved for troubleshooting issues with our plugins built in features under default conditions, and fielding bug reports.
Best of luck with your project! Thanks for understanding & let us know should you have any questions in the future!
Best,
Shelby ?