These file names are normal for every tiki site. They are the compiled .tpl files that are used, and are to be found in the templates_c folder.
Looking at the original .tpl and the compiled .php suggests that something is wrong with the _tpl_vars array ie some of the values are not set. I think this data originates in the tiki_preferences table but I'm really not knowledgeable enough to understand what could be wrong. But I wouldn't have thought there's anything wrong with my php host settings - they run php 5.2.6 and all my non-tiki stuff is fine and my old 1.9.11 stuff is OK as well.