Well, that's fair! It helps if you don't think of it as a wall jump, it's its own thing!
It's really an attack with a lingering hitbox, that just only activates on geometry. It also reflects your characters forward facing direction like a laser off a mirror - trying to hold in the direction you want to jump before it happens is def gonna give you funky results.
Once you get familiar with it it's pretty consistent & expressive, but it can have a bit of a learning curve and we did not do enough to ease you into it i absolutely admit!