Hitboxes overlap
The JUmmbox bar editor is treated like it has the bigger hitbox of a channel pattern, so it overlaps with the top channel's hitbox, which makes clicking the patterns in the top channel harder. 
Edited by Tim Krief
The JUmmbox bar editor is treated like it has the bigger hitbox of a channel pattern, so it overlaps with the top channel's hitbox, which makes clicking the patterns in the top channel harder.