Here is my tablix properties

This is particulary tricky using Tablix...
Give a look at this link: what to do when the RepeatColumnHeaders Property in a Tablix isn’t working
In Advanced Mode select the Static Row Group you want to repeat and set these properties:
.RepeatOnNewPage = True.KeepWithGroup = After.FixedData = TrueIt is also recommended to set Tablix property .RepeatColumnHeaders = True in case Microsoft will release a patch to this strange behaviour.
To get to Advanced Mode:
Advanced Mode check box