pretty certain my mates hasnt got a hole like that, not that big anyway.
Think your problem lies within the air tight seal when you put bottle in. Check the threads, try another bottle or if you have one change the oring on the bottle. also make sure its screwed in right, might need to go in a little more but if its really tight dont force it in further i have seen them get stuck and thats a right pain.
aside from that leak is the marker airing up and firing? or is all the air shooting out the hole