Brother kh 910 machine problem

New to this so sorry I do not understand how you post.Could anyone tell me please what is wrong with my Brother kh 910 machine…When I pull the needles towards me on the needle bed,they stop after around half ins,I then pull them a little bit harder and then they will fully extend.It seems as if there is something under the fins of the bed that causes the needles to catch after half ins.Your patience would be appreciated,thank you

Welcome to the forum!
We need some advice. from the expert @mullerslanefarm