A scan with the default settings shows 0 suspicious files:
A scan with the "deep scan" enabled and the timeline set to "Anytime" shows 205 suspicious files:
This is due to some files that could be detected as encoded content. To solve this just go to Global configuration -> malware scanner tab and add the following path to the exceptions field: /libraries/vendor/voku/portable-ascii/src/voku/helper/data
Umm, it's odd as the engine is the same for both versions.
Adding that path will reduce the amount of files in 180. Anyway can I get access to the site and do some tests to improve the malware engine? If so please send me administrative credentials to the email from which you receive forum notifications.