Geist 2 can get cancelled altogether (not cast) if you quickly try to input a 3 or 4 afterwards, rather than have the 3/4 get buffered after casting 2.
Yep instant cast on 2 and 4, ability default on 1.
I tested in Sandbox and confirmed that all the abilities function correctly when cast mode is ability default (confirm cast). Instant cast has problems on 2 and 4.
I'm not experiencing this at all and I can't get it to trigger with instant cast in sandbox, and I have 200+ hours as Geist. Are you sure it's not your keyboard inputting the key twice, triggering and cancelling it? Can you record a video?
No I don't think its an issue with my keyboard. I changed the 2 and 4 to be bound to my mouse and its still janky feeling on instant cast mode. Its an issue with instant cast making 2 and 4 say that theres no target and not casting immediately like confirm cast does.