we've ran the scan for WP Defender and it is showing up

Hello,

we've ran the scan for WP Defender and it is showing up as 3 minor problems which we have changed anyway. However, the results of Sucuri Sitecheck are showing that the site is infected with malware:
https://sitecheck.sucuri.net/results/paverightuk.co.uk

Is this correct, and if so, why is the Defender plugin not picking this up?