How to delete the B?? i cant seem to press on it at all. i can only press on the D, which is weird.

The 'B' will not be seen if i dont zoom into my score. but if i zoom into it and zoom back out, it's there and i cant get rid of it at all. whenever i open my score, it cant be seen. however, it is also seen when i click on that bar. then the B will appear. is there a way i can get rid of this??