This tab displays the MonkeyAudio APE tag:

Each found item is displayed with its name and content. The content of binary items will be shown as a HEX dump for its inspection.

As the specification of that tags format is very loose and doesn't mandate any specific items or their names, the item names are displayed as they are found in the tag. This might lead to a display with some items being fully upper case while others following different conventions for their spelling.