Missing Interface

We are using Netflow Analyzer 9.5 for several Cisco ASA devices and Cisco routers at several locations. We are having issues with a single interface on 1 ASA. The link status says it is down. When I click the icon to the right of the device or "Interface Parameters", the interface ID says, " Adaptive Security Appliance 'Ethernet0/1' interface". I know that Ethernet0/1 is administratively down. It should be monitoring Ethernet0/3 instead. If I look at history, I find that it somehow changed about a month ago because there was data before. I also know that on the day it stopped working, the ASA was rebooted, but the interfaces were not changed. It has always been Ethernet0/3. My question is why did it start monitoring Ethernet0/1, and how can I tell if one of the other interfaces is Ethernet0/3? Any help would be greatly appreciated.