Ember table gives itself style=height: 2px; making it invisible

I'm using the same exact configuration has in here where they show an example of a basic table, but even though the data is in the table and everything is done the same, it has style="height: 2px".

The only way I've found around this is to specify a height in the component

{{ember-table
  hasFooter=false
  height = XXX
  columns=tableColumns
  content=tableContent
}}

Does anyone know what's causing this to happen?