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Regardless, the number of cases is small really in the big picture. I make it:
713 cases had sent the same amount of sMerit to the same post and person in <= 60 seconds, prior to the 29/12/2018 fix (60 second cooldown time).
431 cases had sent the same amount of sMerit to the same post and person in > 60 seconds and <= 600 seconds.
189 cases had sent the same amount of sMerit to the same post and person in > 600 seconds and <= 3600 seconds.
Out of 209.332 overall sMerit TXs.
Yo cant tell though if the intent was to remerit (i.e I gave 1, but perhaps I should have given 2), or the refresh page effect after periods of time over 1 minute.
Yes, according to your data this looks like only around 5% of the total merit transactions face such merit double sending problems approximately
I agree by looking at the numbers it is not that big of an issue and most of the generous merit sender's would not do such double spending mistakes often.