Strange bandwidth graph

[binkatl]

I have this problem which has been occuring now for a couple weeks. I haven't been able to figure it out so I'm posting it here. Please see the attached gif file, showing what my daily bandwidth stats graph looks like.

I don't think it's really affecting anything, but the graph used to be filled in entirely with green, and now there are all the white spaces.

Any ideas?

[MediaHound]

Check out cacti
http://www.cacti.net/

- awesome tool if your into stats.