Oh my goodness, I have the same problem... although I still have my cervix, my OB said that's normal and it's because she must have missed a piece of the uterus... I don't believe her, but there is nothing I can do about it...
This 100% should not be happening...my guess your surgical cuff is not completly closed, get to your Dr if he wont help see another one this is not normal. If I am correct about surgical cuff ( the way they close vagina top where cervix is removed your at risk for infection as well.
C