AD import works with domain.com but not netbios domain

Recently when trying to import requesters using the netbios domain name it only showed the Users OU from active directory.

I determined that if I switched and used the fqdn - domain.com I was able to see all the OUs from AD and import properly.

The following day I tried logging in as a technician and I could not. When entering my name the domain name changed from domain to domain.com and my password was not accepted. I logged in as another user using local auth and went to admin, technicians and changed the domain from the fqdn back to domain and all is good.

Just curious why this is occuring and is there a way to either make the netbios name work on import or to alllow my login to work with domain.com.