Unpressurized vial?

Hi! my first injection took quite some effort to draw with a 23G needle but over time it was become incredively easy even with a 25G needle, no pullback force or anything.

So I'm thinking, is something like the vial no longer pressurized a thing? and if so should it be cause of concern?

vial doesnt visibly look cored and liquid does not come out either, liquid is also clear with no bits in it.