Shift and being the youngest god, autism, and poor socialization.
There's a lot of nuance when it comes to Shift, more than they like to let people in on. Shift is 221, which, for a god (especially compared to the others that are more or less ageless), is quite young. A human equivalent to it would probably be about 21ish. Dipping their toes into adulthood but still immature, especially when you consider their socialization or... Lack there of.
While, as a deity, they aren't exactly bound to human, or creatian in this context, ideas of neurotypicality it should be noted that the way they are written (by me, also an autistic person), is meant to not shy away from their autistic traits. They struggle a lot with things such as misophonia, self-harmful stimming and aggression. They are also more easily influenced by outside sources than your "average" neurotypical person.
Their actions or more often reactions to stimuli that is distressing to them often makes people consider them to be extremely immature or even downright childish. This isn't to say that their actions should be excused, especially when they harm other people, but in order to be able to find better coping mechanisms and grow as a person they shouldn't be demonized, either.
Bringing their lack of socialization into the conversation, Shift spent very little time with other gods or with other creatians. They had no model to look to on how to behave, and kind of had to make it up as they went along. The government of Creatia denies their existence, half the gods want them contained somewhere and the other half ignore them outright.
Although in more recent years they've managed to start sort of... Well, infohazarding their way into the lives of more Creatians, rarely are they able to really make any sort of meaningful relationships with them because... Well, honestly? They get very overstimulated very easily because of that lack of socialization as they "grew up." Without learning proper coping skills to learn how to deal with things such as their misophonia or aggression or lack of understanding of most social cues, when people act in ways they don't understand or do things that they find upsetting they just melt down because... They were never taught how to get a better handle on their emotions.
Shift also has speech difficulties, another thing that makes people take away their agency! They stutter, repeat themself, and talk a little too loudly. Many people find this off-putting from the get go, even if it's entirely harmless.