What is three ways Karl Marx strayed from communism?

Answer 1

He didn't. Before Marx and Engels gave new meaning to the term 'communism', it refered to radical socialists in general. Marx and Engels developed radical socialism and made it consistently materialist and dialectical, they made it scientific.

Answer 2

1. Karl Marx advocated for the abolition of private property and a classless society under communism, but he did not provide detailed instructions on how to transition to or establish this society.
2. Marx's focus on economic determinism and the inevitability of revolution has been criticized for underestimating the role of individual agency and other social factors in effecting change.
3. Some argue that Marx's vision of a Dictatorship of the proletariat as a transitional phase towards communism could lead to authoritarianism and a concentration of power, deviating from the idea of a truly democratic society.