It's normal for monstera roots to poke out of the soil. Monstera and other hemi-epiphytic plants have multi- function roots. All of their roots are formed from their adventitious roots. This is because these are generally the first roots formed. The only time you will have a monstera with roots that immediately emulate the roots of a plant that has a single stalk and a root system is when you grow one from seed. None of the plants you buy commercially are seed grown. They are either tissue cultured or grown from vegetative propagation (stem cuttings).
The adventitious roots initially serve to absorb water and nutrients AND to anchor the plant onto whatever support it is growing on. They adapt and change over time once they reach soil and become subterranean. Then they produce softer thinner soil roots that take over the function of absorbing water and nutrients while the above ground roots harden and serve as anchors. They will poke out of the soil sometimes as part of their subterranean branching behaviors as the plant gets larger to further stabilize and anchor the plant. They will probably go back underground without your help
