Are the hoods in a similar orientation as your old bike? Is the saddle the same?
As the other poster mentioned, maybe you need a bit of adaptation. If you’re feeling your triceps like that, it’s from supporting/stabilizing your upper body on the front end. The front end could be lower than you think and you’ve shifter more of your weight to the front?
Yeah… was thinking the same…
Never had issues like this on any other bike.