Alright, I had a look at your files this morning and here is what's going on.
The original network, for some reason, has a lot of duplicate points. As in, even in floating point, they are exactly the same.
The first step of the network algorithm, when combining files, is to eliminate any (successive) duplicate points. An easy way to speed things up, and they can mess up some geometric calculations too.
Note that the first line of the network output says there are only 14,656 points -- that's after eliminating duplicates.
So, in other words, there's nothing to worry about.
Now, the question is, how did the duplicate points get there in the first place? Is this a network you have been adding to successively? If so, how times do you think you've added to it?