"Clean Up" on threats not working?

Hi,

Per the screenshot, there are 54 threats on my Mac. I try cleaning them all up - it appears to work (just clicking on "Clean Up" till they disappear), but upon resweeping my system, they are all still there (including Mal/Phish-A, which doesn't look very nice...)

Please advise on how to find out more about these threats, but mostly, on how to get rid of them, which is what I thought Sophos could help with :)

Thanks very much in advance.

Zak