Grid changing list.count type to "object"

Hi,

I have a custom class with a few strings and a list My grid is bound to a collection of my custom class and one of the columns is for the list.count. When the Grid renders, the column is empty. When reviewing the html code for the Grid, I discovered that the object type of list.count is now "object", see below:

{"Provider":{"type":"string"},"Type":{"type":"string"},"Bills":{"type":"object"}

 Where bills is a List<>.