Looking for help/advice on workout problem
 

I recently started working out on a regular basis again. I downloaded the beginner's mass gain regiment in the introductions section and I have been following that pretty closely.

My issue is this. After I switched the doing max weight and low reps, everything was exactly how I remembered it with one difference. When I am doing shoulder press with the dumb bells my left is FAR FAR weaker then my right. This has never happened to me before and it has me extremely frustrated. If I am maxing out at 5 reps on my left, I can do 8-9 on my right with the same weight. EDIT **Just finished a workout and it happened with my triceps as well during skull crushers** EDIT

Keep in mind I have NEVER had any injuries to my shoulders. I feel no pain or discomfort, its simply a lack of strength. For no apparent reason from I can tell.

Looking for any suggestions what might be causing this and how to get past it as fast as possible.

Thanks guys!

Not sure what would have caused it, my main advice would be either:
1) Stop the stronger arm at the same reps as your weaker arm.
2) Do an extra set or two for the weaker arm occasionally to help bring it up to par

I was hoping for an answer that I didn't expect but I am already taking your advice since that seemed the most logical thing to do.

Much appreciated sir!

This happened to me when I first started working out. What I would do is do more reps on that arm EVERY time, until it eventually evened out. When I would do alternating curls, I would start with that arm to make sure I didn't do 1 extra with the stronger arm.

Sometimes the best approach is the most obvious one. : )