This happened twice, resulting in the user getting 3 merits when I only meant to give one.
Their lucky day. I know this has happened a few times to members, I saw it happen with 20 once lol. This is the first time I heard of it happening twice.
I tried finding the post that originally brought this up in the first few days of the Merit thread, but couldn't hack it anymore. I think theymos may have just chalked it up to not that big a deal in the grand scheme of things.
Off the top of my head, a rule where you cannot send merit consecutively to the same post (i.e. you can send any number of merits to a post, but cannot then send that same post more merit without first meriting another post).
I would think if deemed worthy of repair there is a simple rule that could be added to the code similar to the timed post gaps, applied to new member accounts. (Here is where my ignorance of programming difficulty comes to light)
I did come across your post while trying to find the other one Vod. Your situation was more inline with your merit showing up as 2 different entries of 5. I belive the issue here to be more related to the accidental page reloading automatically assigning the merit a second... or third time.