Strange numbers for data sent and received online--possible keylogger?

I was checking out the logs from my Internet service provider and I noticed some strange numbers. Most of the days I'm logged on, I receive more information than I send. And then I see that one day I sent 2048.0 MB exactly.

 

The weird part is that this happens at least once a week or so, and it is ALWAYS the same number. 

 

Is it possible that I have a keylogging issue or some other stuff roaming my system?

 

Full System Scans by Norton and MalwareBytes show up negative.

 

I've got the latest updates by NIS & MB.