I have the same issue.
I have a text field that contains a year, in this case 2015. On my computer it works fine, but when I deploy it, the field says “Array”…
When debugging on the staging server, where I just deployed, it outputs [“2015”, “2015”]… I have no idea why it’s double.
I tried to delete the page, and import it again, and it said that the post already exists. So maybe that could be why… but the post didn’t exists after I deleted it… I’m stuck… 🙂
