On reflection, I'm less inclined to argue so strongly for the position I adopted at #53. I can see an argument for saying that the total tally of scores is 16, but I shall stick to my total of 17 on the grounds that "their entries are scored according to the locations of the interrupting letters."
I think the editors will be obliged to accept two solutions. The puzzle is inherently flawed because of a flawed preamble and an internal inconsistency. The preamble implies there are 16 interrupting letters, but there are only 12 such letters. The others in the centre don't interrupt anything. By forcing solvers to create 16 instances of the letter the puzzle has created the ambiguity concerning those two entries at 13 and 14. If only one instance of the letter appeared in the centre the problem would have been avoided. A carefully worded preamble would have led solvers to count it four times, once for each entry to which it belongs.
As was said earlier, it would have more consistent to say there are 17 instances of the letter.