I've got following problem and workaround fixing it in all versions of PmWiki. If you can proof that, too, you might move this hint to the FAQ of CustomWikiStyles.
Combining the attributes %lframe% or >>lframe<< with unordered bulleted lists right beneath will cause problems in showing the list.
Here's the list that isn't shown well
Even through multiple points (** or ***) the problem isn't solvable.
Workaround - my alternative
(:table:) (:cellnr width=180 class='frame lfloat':) ... (:cell:) ... (:tableend:)