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Description
When there are multiple author lists due to e.g. direct submission and publication being present on a Genbank record and the 2 publications contain the same author with differing numbers of initials, NCBI virus and datasets seem to not deduplicate the authors.
Note that Marti,M.A.
and Marti,M.
is the same individual appearing twice in NCBI virus (and datasets):

https://www.ncbi.nlm.nih.gov/labs/virus/vssi/#/virus?SeqType_s=Nucleotide&ids=MG773272
The likely root cause is that the authors list is generated by making a set of authors from all references of the genbank record:

https://www.ncbi.nlm.nih.gov/nuccore/MG773272.1
In this case, the direct submission lists Marti,M.
while the publication has Marti,M.A.
.