Base image not changing after import.

[EnigmaWebdesign]

// Provide a general summary of the issue in the Title above

Preconditions

// Provide a more detailed information about you Magento, Apache2/nginx, PHP & MySQL version
// Provide example CSV file to help us reproduce your issue
We're using Magento 2.2.7 on Apache2, PHP 7.1 & Mysql 5.7.29.

Steps to reproduce

We did a test with 1 product. Imported with a standard base image since we didn't have a product image when we started importing. In our example I have filled columns, thumbnail, small-image and image with baseimage.jpg. We filled the media gallery with test1a.jpg;test1b.jpg;test1c.jpg;baseimage.jpg. If we change the column image with test1a.jpg and we import the csv again baseimage.jpg is still set as the base/thumb/small-image in Magento 2 and
not test1a.jpg.

Actual result

Whatever we do after the initial import we can't get the base image to change to the new baseimage. What are we doing wrong? I've added a screenshot of the image settings in Magmi.

This is the image after 1st import:

These are the images after adding correct base image:

The newest image isn't set as base/small-image/thumbnail???
CSV columns dictate otherwise.

Cheers,

Steve

[EnigmaWebdesign]