I don't really understand why do you take that detection so seriously... Especially if it is IOBit Malware fighter, it might not actually even be Bitdefender module in reality...
Even if it is the real Bitdefender engine, it really doesn't show much...
I have used IOBit software in the past, it was pretty bad.
I take everything relating to my PC security seriously. I trust Avast enough not to disable it right now, although it still bothers me.
I have my firewall setup to disallow any connection that is not on the whitelist, IOBit is not on that whitelist, so I dont trust it enough to be on it, as for Avast is has limited internet access, only certain ports.
IOBit does its job, and for me it does it pretty well so far. It has some security features that Avast just doesn't + that extra BitDefender scanner. I also use Kaspersky Virus Removal Tool every few months (didn't run it for a while now). So that must tell you something about how serious I am about security. 3 AV scanners and a custom firewall settings to disallow everything except trusted apps an certain ports.
Edit: And to be honest I am a bit pissed off about Avast that they don't provide any help for free users except through this forum (if even that), so I'm sorry if I'm being a bit snappy sometimes but that's the reason why (and of course mostly because my issues are still unresolved).