Two different looking automatic news digests sent

We are implementing an intranet based on SharePoint Online. As soon as we created some news, some people got automatic news digests https://support.microsoft.com/en-us/office/automatically-sending-news-post-digests-with-branding-b930b579-0de5-4c67-86f0-de64b87c45e3. However we noticed that 2 different looking newsletters are sent:

• One with a colored header (left, color depending on the background of the Suite Nav Bar?)
• One with a white header (right).

Also the company logo (.svg) is missing or for some of our customers it's stretched.

What is the difference between these two different looking news digests?

Why is the logo not shown at all or stretched?