Could someone explain please?

Hello there,
I have searched in a somewhat relevantly keyworded manner but cannot find a solution or any result.
My issue is that lately my chatlogs have been screwing up, I've usually formatted and reinstalled, popped in the chatlogs folder I backed up and off I go, it logs like heaven. Never had any problems at all.
It is true that I have changed between user account names as sometimes I use Administrator and sometimes it is John, however "never" have I ever had any issues. I even opened up all my chatlogs after formatting to check they were fine, and they were "until" I set up msn to chatlogging, which now nearly each month of logs has all this junk at the bottom.
So anyway this is what appears;

I just cannot understand why or how it can even touch the other months, all it's supposed to do is log but clearly no longer succeeds in doing that either. Just for extra information, I am using the msn 2009-2010 with the corresponding msgplus. I have always had the installers saved since then so nothing has changed in any way, nor the settings I make.
Thanks for any help and advice.

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