I had this with 2 monsteras. One, it out grew the nursery pot. Once I repotted it and gave it fertilizer it doubled in size in 2 months. I had to repot again. Now, a year and a half later I had to put in a 13 inch pot, when I bought it 4 inch pot. It is wild one growing everywhere, I got tired of repotting as its roots took over each pot and just put it in the big pot and recently added stakes. The second monstera had rotted roots. I cut all the black roots off and poured hydrogen peroxide on them. Repotted it, and it slowly made a come back
What I learned, the roots were growing quick and root bound, barely any soil to get nutrients. And if you over water it will get root rot. I am not sure if the nursery over watered it. All there monstera at that time were rough looking.
If you look at my monstera today a few leaves look deformed from the root bound, but it is growing like a champ! Next year I may have a 5 foot tall monstera.