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I've seen anti-c reacting with the reverse grouping cells many times. I've only seen anti-e reacting like that a very few times.

I just answered this question. My Score PASS

Your results suggest to me that your QC reagent is deteriorating, maybe, perhaps, subjectively speaking, of course.☺ I am well aware that manufacturers test every cell for every antigen and that the results must meet a certain threshold. However, as Malcolm suggests, "decent strength" can be a very elusive target. One direct test with undiluted antisera (or a strategically-diluted sample) does not always give an honest indication of antigen strength.