how do i fix this

i’m an exclusive pumper for 3 months. but lately i’ve noticed that nothing comes out of my right breast unless i squeeze it ? my left drains perfectly fine.

anyone know why ?? i’ve tried every setting, replaced all the pump parts, only thing that works is squeezing while my pump is on.

and i’ll get a strong stream and it’ll flow the whole time i’m pumping but without squeezing i’ll get maybe two drips at a time and my breast will still be full ?