Originally Posted by
M4tt3
Thanks Barry. Also for your call earlier. I will see the type of the hub once I am able to remove the cassette as so far my screwdriver/hammer approach resulted only in few cuts on my hands. It's properly stuck there. I would love like to claim that the shifted casette is a the result of my super legs power and the wattage going through the pedals but somehow think that the answer is different.
That almost certainly happened because the cassette lockring wasn't tight enough. The threads should be greased and forcefully tightened so the cogs are trapped against each other.