Hmmm I know one response you'll get is how many games you have played with this catcher. If the sample size is too small, then greater variance could be expected, along with a gradual return toward the mean, and so forth. (I am assuming that EFF is a derived stat, rather than a rating. If I'm wrong in that, please disregard.) The other variables would be league environment and its effect on performance. Are other catchers experiencing the same thing? That, after sufficient play to normalize stats, might suggest that an adjustment to your league AI settings is in order. That's beyond my present grasp; but there is another thread on ratings and stats where others have studied discrepancies and suggest fixes.
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