Strange entries in my Webalizer report

I'm looking at my December Webalizer stats for my multisite at and I'm seeing some strange entries in the "Top 10 By KBytes" section. There are 7 out of 10 entries that indicate 0 files and 0 visits yet they're creating hits and using bandwidth. The 3 that are generating visits are recognizable but I have no idea what’s up with the others. I looked back at stats for a year and this seems to have just started this month. Can you offer any insight into what’s happening here and what I should do about it (if anything)? I'm already using WordFence on all my domains and I have about 25 of them on this multisite.