Hi Jon,
When you submit an article that has an unbalanced amount of spin brackets it tells you that you have more than 3 hyperlinks instead of telling you that you have an unbalanced amount of brackets.
I contacted support about this on the 1st of January ticket number #22795
And the reply was...
Thank you for your suggestion.
It is much appreciated.
But I just got the same error message when I had a { missing so nothing has been done even though they appreciated the suggestion.

To reproduce the error just sentence spin an article with 3 variations and then leave a bracket off of the end of a sentence with a link in it. So it's not reading the | that is separating the links when the bracket is missing. You need two other links in the article as well so that it assumes that there is 4 links in the article.