Do you have a photo?

I'm posting 2 photos of one of the affected leaves as well as one photo of a normal leaf for comparison.

Affected leaves are reaching full size, but they are thinner, paler green, and distorted. The leaf veins has red in it and one of the leaves also have a whole which is ringed with red.

I won't let me post the 3rd photo in the same post. So here it is, a normal leaf! Such a pretty green and perfectly shaped too!

the new leaves are always thinner and softer and lighter looking. it takes a couple of weeks for them to harden and then they'll darken in a month or so.

i don't see anything particularly wrong, except that 1 spot. it can be some sort of mechanical damage while the leaf was unfurling - they are extremely soft then.

Thank you. Leaves are usually thin when they are brand new, but these ones are staying thin and pale for awhile now. They also a distorted shape. I'm thinking it's because I moved them around to another window for the fall and might have damaged them when I did. And the new leaves could be taking longer to firm up and darken because of the stress. Nothing else seems differnt about the plant so I"m just going to chalk it up to that.

what sort of place is it now compared to the last one? is it cooler by any chance? they hate cold - these are super tropicals - 85F and 85% himidity is preferred :).

what is your season now? is not clear where you are located. but by the window, if it gets cold at night, is not a good choice. it's better to keep it warmer and darker then colder and brighter.

since you said it's still blooming - it's a good sign: it means it's getting adequate light.

I'm in Canada and the days just started getting cold and short. The plant use to be by a north window in the kitchen, but with the summer ending it wasn't getting enough sun so I moved it over to the other side of the house. It's a few feet from sliding doors with a south exposure.

I think you hit the nail on the head with the temperature. For a few days, before we turned on the heat, the house was at 17-18C, definitely not tropical weather. We also opened the sliding doors a few times, but won't be using it during the winter. The heat is on now so I hope things will go back to normal.