Thank you Elizabeth. I will try those steps next. I did try converting to azw3 and I have tried using calibre to send the files to my device but none of that worked either.
As for Peter's suggestion, I downloaded an epub file where you suggested:
https://www.mobileread.com/forums/sho...d.php?t=178760
I converted it to mobi and it doesn't show up so if anyone wants to try to use the same file and see what happens please feel free. As I've said before, I am at a complete loss. I've used Calibre since I bought my K3G over a year ago and never had any problems until I got the KF.