The submission system cannot have only one first author. According to relevant public information, some journals can be tied for the first place, such as SCI, but this is rare. There is basically only one first author in domestic periodicals, because they all come in the order of authors at the time of submission, and whoever ranks first is one article, and the second is two, so there is no such thing as tied authors. Even if it is tied, there is always an order in the paper, so it will eventually be determined in order, and even for journals,