Hi, I contacted Massive Addons and the developer took a look. He had this to say:
I am sorry to say that, but I think you should contact Theme support once more. Here is why:
Even when all Plugins except for Page Buidler are deactivated, there is still issue with native buttons. I am talking about Read More buttons that you use in Three Columns on your Home Page(those, under pictures). It is clearly has nothing to do with any other Plugin then Page Builder or Theme itself.
I suspect, that issue with Massive Addons buttons(one of them, you are using right above the mentioned columns) is related to the core issue, that I just explained.
So ask your Theme Support, why even with everything turned off except for Page Builder, native Page Builder's buttons are still displayed not correctly.