Duplicate atom ID in elements.xml.
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egonw
In elements.xml both atoms "Fl" and "Lv" have a node id of "Fl". I generated a CSV table of exact masses and found duplicate atom symbols because I had lazily and incorrectly used the ID as the atom symbol in the output.
Not a critical issue, but it is probably a good idea to fix it at some point.
In elements.xml, release 10, line 2599 onwards:
And many thanks for this wonderful resource of chemistry facts :-).
Thanks for making me aware of this! Indeed worth fixing, which I will do shortly.