You have reported that you have removed the old responsive options, this has made the sites a mess. And the problem is that in SPPB 3 col-md- was from 992px up, now it's from 768px, and col-sm- was from 768px now it's from 576px, can you imagine 4 columns in 768px? they look crushed.
They have to retrieve this according to the device for which they were created. That is if the data is not Objects of the new responsive then retrieve from col-md- to col-lg and from col-sm to col-md and everyone is happy, because now the content on 768 tablets looks like vertical lines
Thanks.