Add-ins issue when filtering purchase order date

Hey everyone, I'm trying to put together a custom PO History report but I'm having an issue with the PO Date field. 

I'm getting most of the data from the POLINE table. Current fields are

PO-Number

LINE-NBR

POVAGRMTLN.BASE-COST

POVAGRMNTLN.UOM

PURCHORDER.PO-DATE

When I use criteria selection on PO-DATE >= 06/01/2016, nothing comes up. When I use an "=" sign, I get records. 

When I limit the amount of records to 10 and use the >= sign, I get some records with a PO-Date of 1/15/2015 which makes no sense. 

Any ideas?