Some our clients have upgraded to 2.7.0 version in few days ago, and they got some issue in our theme. There was a problem when BigCommerce engineer deployed the theme update. We'd recommend to revert back version 2.6.0 until BigCommerce engineers address this issue.
To revert back, you need to make a copy for the origin theme first, in the revert process you may lost your theme setting, so we need a backup if you truly lost your setting, you still recovery your setting.
Then click on the "Customize" button, you will go to the theme customizing page, find History section in the left sidebar and select the previous version 2.6.0.
We're sorry for this problem, and thank you for your understanding.