It looks like some pages were written in restructured text.

  http://www.roundup-tracker.org/cgi-bin/moin.cgi/CloneAnIssue

is formatted correctly while:

  https://wikibeta.roundup-tracker.org/CloneAnIssue

says:

  Rendering of reStructured text is not possible, please install Docutils.

The page shows the raw input. I am not sure if reST can be supported by the new vendor. If not, we probably need to figure out how to identify the pages and manually convert them after the import. Alternatively  convert them with a program as part of the import.

-- rouilj