The number of authors doesn't seem unusual there, and a high number of authors doesn't have to indicate anything problematic.
There are many valid reasons why author lists can get rather large on scientific papers. Anything that is even a bit interdisciplinary will usually multiply the authors because you need collaborators with the right expertise and can't do everything yourself.
There are many valid reasons why author lists can get rather large on scientific papers. Anything that is even a bit interdisciplinary will usually multiply the authors because you need collaborators with the right expertise and can't do everything yourself.