It's a change with Flot, there is now a setting for which axis (1,2,etc) as well as which side of the graph that axis is on! So setting yaxis:2 makes it so that particular set of data appears on a second axis on the left which is the default. I messed with your code some trying to get it to properly set left vs right side but I was not successful. Try making that change and see if you get the same thing.
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Could use a setting to allow for setting what side of the graph your yaxis 1 and yaxis 2 are on, as is both plot on the left side.
I think you can do it easily,
Just add
yaxis: 2
to the graphing formatting data.
PS: Sorry for the late reply.
It's a change with Flot, there is now a setting for which axis (1,2,etc) as well as which side of the graph that axis is on! So setting yaxis:2 makes it so that particular set of data appears on a second axis on the left which is the default. I messed with your code some trying to get it to properly set left vs right side but I was not successful. Try making that change and see if you get the same thing.