Steps to Reproduce

run fiddle
http://zkfiddle.org/sample/3vflpag/1-columns-percent-sync

Current Result

Headers and columns are not synced

Expected Result

columns and headers should sync

Debug Info

Happen when at least 1 column uses % based value for width.
Even if all columns use % based values, sync breaks on browser zoom

Root Cause

Workaround

Scrolling around the listbox instead of inside the listbox, can be done by:
-Wrapping a scrollable div around the listbox holding the height informations.
-Not setting height information on the listbox itself or setting vflex="min" to force it's height to include all children.

Or
Avoiding % values in columns / headers