Some fonts are not supported on Tableau Server, so it may be forced to convert to another one. That doesn't really explain why it changes from one to another, but my guess is that you're original font is not supported. I'd suggest changing to a supported font and seeing if the problem goes away.
Hi, just following up on this one. Let us know if we can be of any further assistance.
Thanks Ken. I republished the panel and all went ok. I guess was some sort of glitch.
Thanks for the follow up!