Defender not defending

I have installed defender and have been using it, but my site has still picked up malware. I had to spend most of yesterday getting my web guy to get my site back online and now we are working again. (I have included screenshots of my site with the problem before, where you can see some of my site and after I used defender where the screen shot just shows the error and no site)

However emails from my site coming to my gmail account are warning me about my site having malware in its hosting. I wondered what that meant.

I only have three issues (attached), but yesterday I had 9, I fixed them using defender and deleted the plugins using defender too, but straight after that my site vanished.

I wondered if you could help guide me? I am currently trying wordfence to see if I can find a malware error