Vendors Not Showing In My Purchases

[KNSoap]

When I try to refine purchases to look at purchases from 1 vendor, not all of the vendors show up in the drop down list and you can’t type in the box to refine it to the vendor you want that’s not listed. I have added a ton of vendors to my vendors list and only a small portion show up in the drop down list As you can see in the screenshot.