Can you try with Tiki12, and if this still happens, fill in a bug report against it?
(when the issue is found, it can be backported to 9.x)
You can add a bug report at http://dev.tiki.org/Make+a+Wish , and then, create "show" instances (for 12.x, and if needed also for 9.x) where you reproduce the bug, with clear instructions on the steps to reproduce it there. This way, i'ts way easier for devs to provide feedack to your isse (maybe config problem? maybe a bug, etc)
Thanks for your help to make Tiki better, and welcome to the Tiki Community, of course!