Gap in ROS Rx rate vs FTP Rx Rate ?

Thanks for your interest.
I’ve got a RouterOS L4 setup as a x86 virtual machine.

I’m transferring a large file (3GB) over internet.

RouterOS shows this Rx rate on the pppoe.

But Ftp shows this rate to the server.

Is this ok? are packets being lost somewhere?

Have you ever heard about bits and bytes?