The B7 chord is a bit of a squeeze for all 4 of our fingers, but it’s very achievable.

A quick check by picking each string will determine if you have any muted notes or buzzing. Do this will all new chords.

If you do, then push your wrist forwards, apply a little more pressure or move away from fret markers. In some case it’s just a tiny adjustment that makes all the difference to the tone.