First of all, if we want to talk about the battle between Altman, then in the Leo Altman, because babar became Astra, he was chased by the Otto brothers for stealing the key of the country of light. When Altman chased babar, he came directly to the earth and found the Leo Altman. To tell the truth, there was no defect in babar's disguise at that time, so Leo Altman didn't find out that his brother was actually a Babar. On the contrary, when the Otto brothers tried to arrest Astra in order to get back the Otto key, they were attacked by the Otto brothers with lightness skill when they tried to defend their younger brother. So for Leo Altman, it is because they are foreign giants, and there is a relationship of mutual distrust between Leo brothers and Otto brothers, so this is the reason for their fight!
Secondly, at that time, in addition to the battle between Leo and Otto brothers, it was the battle between Gauss Altman and Justice Altman. But for the battle between them, Gauss Altman, a "brave man of love", thinks that monsters can live with humans or Altman, and can be said to be the only Otto warrior with good intentions. However, for Gus Altman's partner Justin Altman, in their world, he only has the idea of protecting the earth. As long as he can protect the earth, even if all mankind dies, it has nothing to do with him. And Justice Altman's idea is different from Gauss Altman's. So that's why they fight!
Finally, from the two points of view of appeal, in fact, not all Altman soldiers come from the same place now, so different world views often lead to fighting because of some situations, and they are not familiar with each other, so this is like the situation between Leo brothers and Otto brothers, so this is the reason for the fighting between Altman!