A year later, the problem went away, I can see all my interfaces now. When I have this problem, it was like 1/50 times clicking on list resources that I would see all my interfaces. I did not upgrade any of the Solarwinds module, still running NPM 10.4.2 and etc.
I did upgrade my memory, diskspace and cpu to the VM Solarwinds server, after I told my Server guy the server was running slow and I need more resources, but can't tell you if that was the fix, I just only notice it recently when I had to delete some interfaces on my core that we unplugged.