Let me apologise in advance for all the screenshots.
I have some text in 72 point Garage Gothic Bold. I want to make a faux superscript so I change the text size of the letters ‘TH’ to 36 and set the baseline to 25. It looks good so far
If I deselect the text object by clicking onto something else on the image the ‘TH’ drops
If I then hit Cmd Z to undo the text reverts back to the proper positioning that it had when I had the text selected
Here are the text settings for the faux superscript