I had a Text Render that was showing backwards from how I wanted it, but I couldn’t get the rotations working how I wanted, so I got overly clever and decided to try something else. I changed the Xscale to -1 and while this indeed worked to flip my text, it no longer did the horizontal centering properly.
Steps to repro:
Create a new blueprint
Add a text render and a box, set the text render’s horizontal alignment to centered.
Position the text centered and above the box
Edit the text render’s Xscale to -1
Confirm the text does flip horizontally, but is no longer horizontally centered above the box
None of the options left/center/right really seem to work with the negative Xscale, but since it allows you to use negative numbers here, I’m guessing this is just an obscure bug. The Yscale and vertical alignment exhibit the same broken behavior from what I can tell.