Avast Mobile vs Avast for CPU, threat detected

Today I ran a full system scan using Avast on my PC. It picked up quite a few threats on my backup of my cellphone. I am using Avast Mobile on my Samsung Galaxy S4. How is it that the PC version recognizes these threats but Avast mobile does not. The threats were JS:Redirector-BJB, JS:ClickJack-B, and Android:PrivacyGuard-A. The first two seem like legitimate threats but were not detected by Avast Mobile on my phone in a scan done today. The last one may be a false positive. Should I be concerned about the first two being on my phone?

How did you do that?