In the Nestle-Aland Greek New Testament, 28th Edition, in 1 John 1:1, the first word (Ὃ) is labeled as masculine, which it is not. In fact, later in that same verse, the same word (same form, same grammatical usage), it is properly tagged as neuter. My other Greek New Testaments don't seem to have that problem, but I only spot checked a few.
The morphological database is copyright, 2006-2012 Logos Research Systems, so perhaps someone with FL can fix it. 