Your Split-Leaf Philodendron (Monstera deliciosa)
is really beautiful and it looks like you have a nice plant collection going on in that room!
Unfortunately, problems often arise when plants are repotted and the roots are disturbed. The yellow leaf spotting could be something as minor as the plant acclimating to it's new pot and soil, or it may be a viral or fungal related issue but I wonder if it may be fertilizer related, especially when you say:
"I don't regularly fertilize but have used philodendron food and miracle grow all purpose plant food 3 weeks ago."
I don't know what philodendron food is but I don't think there is ever a need for two types of fertilizer at the same time and I wonder if possible over fertilization may be the cause of the yellow spots on your Monstera leaves?
I'd advise to keep the plant in a location of bright light with no direct sun and to completely flush the soil the next couple of waterings to try and flush out fertilizer salts. I rarely fertilize my container plants but when I do, it's only during the active growing season of summer. I think plants (even those in containers) have a habit of slowing down growth and resting during fall and winter.