Chopping & changing instructors each flight isn't the bst thing to do but then sticking to a single instructor & never flying with a different one isn't a good thing either.
No instructor knows the lot. Some amount of flying with a different instructor can be very beneficial.
I reckon that a change for a while is a good thing from time to time. A change can also be beneficial if you're just not getting something. A change of instructor style or technique might be all you need to advance.