False Checksum Match Errors ?

Hi,

I made a scan of my site using the plugin tool (Free version). It shows me Checksum Match Errors (High) for the following plugins :
– Contact Form 7
– Contact Form 7 Honeypot
– Foobox
– Sticky Menu (or Anything!) on Scroll
– Secupress

But when I compare the reported files with the original version (download from the official wordpress catalog), the files are strictly identical.
Why does the scan report these errors and where does it come from? Is there a solution to this problem ?

Thanks for reply