I have a problem with the BOM in the assembly file.

I'm adding custom property columns like material, vendor, stocksize, etc......

The problem is that not all of the items will show the information in the cell. Some do, most don't. I cannot see the difference in the part file under the custom properties but only a few will display the information. The same parts will display properties in other columns. I have also added those same columns to my template and it still doesn't seem to work.

Why is this happening?