@Ipanna - I don't see any evidence of pests or pest damage. A photo that shows the dusty stuff you are wiping off would be helpful.
Your Monsteras may be getting a bit too much direct sunlight that close to the window. They may also be underwatered just a bit. Both are at a point where they could stay for a while longer in their pots are be up-potted one size.
Water them very thoroughly as soon as the surface of the soil is dry. If the soil dries again after a few days, then it is probably best to up-pot.
