K9 Not Finding All My Contacts

I have recently installed K9 on my Kindle Fire. Normally an email app populates your ‘To’ field with a few keystrokes, drawing from your device’s Contacts. Only three of my contacts show. K9 is not accessing my entire list. It seems to not see contacts that were not frequent contacts since using K9.

And, yes, I have K9 checked for access in my Kindle’s apps permissions.