Melanie, I'm now uncertain if I understand exactly what happened, so I'll just make notes.
1. Not a Wikitree topic, but interesting for the contrast. On Wikipedia you should not input information which is based on your own original research, even if it is good research. We are supposed to summarize what has been published. If all publications contain glaring errors, we are not supposed to put anything until someone publishes something better. On Wikitree we ARE allowed to research.
2. If I understand correctly, you did not correct a direct quote from a publication. You wrote a text yourself, which cited one or more publications as sources. Correct? And you used similar or identical words on WT and WP? I think this happens a lot, and it is kind of an "advanced" issue compared to the more basic problems I was trying to raise. However, on Wikipedia, when an editor copies a handy sentence from one article to a related one, technically you are at least supposed to mention you are doing this in your edit summary.
In reality however, I think that as long as we are talking a sentence or two, and they were written at roughly the same time by the same person, this is a rather academic concern and not going to cause any major problem. I can very much understand this type of case because I often work with several windows open on WT and WP, updating several articles at once.
But technically (a) we can't quote Wikitree on to Wikipedia, so we should supposedly write a new text, although of course if it is just a few words like "was born in" then that is not the issue; (b) it seems acceptable to quote Wikipedia in Wikitree, but then it should be clear we are making a quote of course. :)
There is a bit of a grey area here then. To determine if something is a quote or a paraphrase there is a question of how close the wording is, and how large and original is the text is. A series of commas and ands, even "died in" and "lived in" between numbers is not really an original text for example, and so not relevant to this type of concern about quoting. (The data, such as dates and numbers, should be sourced of course.)
It is often simplest to just make something a clear and open quote.