Different Translations
It seems like there are 3 translations going around, The official Vertical translation, the fan translation, and the Crunchyroll official translation.
The general consensus is that the Vertical version is by far the worst, filled with broken English, and the Crunchyroll version is the best.
Does anyone know any site that has the Crunchyroll version? MangaSee, MangaDex, Mangakakalot and MangaLife all have the Vertical translation or fan translation.
This tumbler post shows some of the many differences between the CR and V versions:
https://pleasesavetanaka.tumblr.com/post/144532822358/ajin-vol-1-crunchyroll-vs-vertical-translation