Mine is playing up exactly the same.
I swear it was even and is now not clicking on the right bottom corner, infact has lost sensitivity almost completely when using the full click. If you have this issue make sure you have "Tap to click" enabled in preferences>trackpad as you dont need to click.
I have spoken to apple and they say to bring it in for replacement which I will when ive got a spare laptop, shame there isnt a nearer store but its going to be a week between dropping and being able to collect.
I'd give Apple a ring and make an appointment, if its not clicking then its a hardware rather than software.