Easily reproduced by:

Also take note of the Prio NaN%'s
The NaN% is coming from the wrong .XSL template, when you check the source the XML is fine.
Screenshot in report is broken. Is this specific to baseline SEO plugin or only with Video?
No longer relevant, we don't show the Prio any longer in the sitemaps.
@benvaassen The original issue was about the wrong XSL being picked up when the sitemap was being reloaded. The prio thingie was just a side-note.
I'd suggest re-opening the issue, testing whether the original issue still exists and if not, closing it for the right reasons. If it does still exist, we may want to address the issue ;-)
Thanks for the info! Read the issue too quickly. Will revisit this and test when I have the time 馃憤
Tested this:
Therefore, I'll close this issue.
@benvaassen Just checking: did you test with the Video sitemap ?
Yes I did :-)