when i was training shoulders today i noticed that i was unable to complete as many reps as i did during my last few workouts. A couple of weeks ago i was able to do seated barbell shoulder presses, 190x6- today the most i could do was 190x4. When i went onto the dumbells, i managed to get 90x5 reps, down from 90x7 reps a couple of weeks ago.

Also noticed a slight loss of strength when training biceps, i got 120x13 reps a few weeks ago with standing barbell curls, most recently the most i could muster was 120x12- could not possibly get the 13th rep that i wanted.

so anyway is this normal to experience, and is it possible that i can make any gains here off a cycle?