This glitch has been happening for some time now… I work in Chrome and when I replace a centered CTA button in the email editor the button previews correctly in the editor with the new button text and centered placement. If editing is continued, the wysiwig keeps showing this way, BUT if you refresh or leave and come back it wipes out the centered selection and defaults back to the left.
I usually remember this, refresh and re-apply the center positioning, but on those occasions I don’t it causes a 2nd round of approval before I can move on. Please either correct the preview, so it appears correctly, so it’s immediately known to reposition, or don’t default back to left justified.