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It's skewed because they had a very low first month rate. The later months are compared to the first, in order to make it more directly comparable to the rest of the stats I have used. This can be skewed when users take more than a month to become active after joining, such as happened for this account's onboarded users as well as @steemmonsters in the post yesterday.

I cap it at 100% rather than let the outlier push up the vertical axis in any charts.

Ahh okay makes sense, thought it meant 100% of onboarded users became active the 2nd month at first which doesn't make sense to begin with since that number represents total accounts they onboarded til today.