Just a guess, air might be to dry possibly from room heat sorce

Is the light inside similar to what it was getting outside? Could it have happened to get too strong of a dose of fertilizer? Maybe got too cold before coming inside? Is the floor cold (if plant is not on a stand?) Maybe add a pic of the whole thing?

The light indoors is darker than outdoors, but that is no different than last year and it put out good leaves then. I don't think I have given it any fertilizer since October and a weak dilution then. This is also one of the few that came in before any temps dropped much lower than 55 (though it has suffered worse before). It is elevated on a wheeled tray by about 2-3 inches and sits in the center of the house between vents which blow away from it. It is only the new growth that is affected and this growth started around the beginning of December. I will get another pic of the full plant later.

It looks like the leaves are having trouble unfurling due to dry soil. The difference this year may simply be that the root mass and plant have grown bigger, so it uses up its water more quickly. Make sure the soil isn't dry when the leaves are unfurling and I bet this problem will go away.

By the way, that is a 'monstera deliciosa'. Not a philodendron.