Some critique I see for Chase's character is that his dislike for invisigal comes seemingly out of nowhere and doesn't make sense. I could not disagree with this more and here is my reasoning: he's re-appointing himself as a protective figure. Robert lost his dad at a young age and likely never experienced having someone shielding him like that, especially since his dad was also never around either when he was alive. So the advice and direction probably came from Chase the most growing up.
Knowing this it seems natural that Chase would fill in the spot left open by Robert's dad as his big brother. And even when Robert leaves and then re-enters his life, Chase just goes back to that same place like he never left. In a sense he's relieving those years again even if Robert is grown and doesn't need that much guidance anymore.
So, if you look at it in that light it makes a bit more sense why Chase is extremely wary of invisigal and is trying to protect Robert from the perceived threat.
In a nutshell Robert is still a little guy and he feels like it's his duty take care of him
