hi I have two variegated monsteras I have from cuttings the one is doing fine and as the other is growing a new leaf it starts to turn brown around the edges and creeps up the leaf and I have to keep cutting the leaves off not sure why, the first pic is a few weeks ago when it started and the other is a new photo and it’s just started happening on a new leaf again now
This could be a bacterial or fungal leaf spot disease.
Decrease the watering and make sure you have some air circulation around the plants.
Use sterile tools to make sure you are not transferring the disease.
Destroy all diseased plant material.
You can spray with a fungicide.