List Tablix Not Populating the 2nd Rport Column

Hello,

I've set the Report property Columns = 2 then created a tablix List.  When I render the report the list populates as expected in the 1st report column then, instead of populating the 2nd column on the first page, it continues on to the 2nd page 1st column. It's as if the report property 'column = 2' is being ignored.

I've made this work before and know it possible. I've tried to start with a fresh report. I've tried with a fresh tablix.

Things I've checked. 

Is the tablix list width less than 1/2 of the of the report 'body' width

The report page size is more than double the tablix list width.

Any ideas?