Aim Offset issue, help needed please

Hi, i’m trying to create/modify and aim offset for my player character and i’m having an issue, after setup the two axis, yaw and pitch and set their values i put the first animation on the graph but after that i can’t keep adding animations, is like the aim offset is going to read only mode and all the animations that i throw at it doesn’t remain in the graph.

i can add only one animation to the graph

any ideas on how to fix it or why it is going on?

thanks in advance for all the help.