Hi Dek. Thanks for coming back to me. Let me explain further please.
1. This black background is not coming from the image itself. Please see this screenshot below. The area is black. I will try to inspect this further. Perhaps we can override the style?
2. No, we want this ordering in the order each portfolio category was created in, not alphabetically which is the case now. This is to have control over the ordering. We need to sort by tag_ID I think. See below:-