Fixed it...
Long story short. I was comparing strings and for some reason it was saying 00 equaled both 08 and 09 but that 08 and 09 didn't equal either 08 or 09, and showing for those months the results of the fills that had no associated date. Anyway, after much messing around I fixed it and the graph is now accurate. Not as dramatic as could be but it gets across the point all right.
Graphing is hard! But hopefully from here it'll get easier
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