It can be a contaminant in your new potting soil but more likely it's low humidity. Try putting a tray of pebbles with water at the base, beside it and see if that helps. When it gets cold outside and the heating comes on inside, the air gets too dry. I have several trays of wetted pebbles for my plants and it definitely helps.
@gjones is right about humidityfactors👍also proper watering is an issue but the plant looks very healthy, those bottom leaves look more like it had a prob when it was unfurling early on @elainehampagne
The soil is quiet wet as it’s been recently repotted, and the bottom leaves were straight when I first bought it. Two weeks later it started warping and also there’s sort of a waxy film on it. No bugs in sight yet though. Where I am in Toronto, we had a heat wave up until yesterday @tinaaune @gjones
If you don't see any bug infestations, sometimes patience is my rule of thumb. Since we have vast changes in humidity, temperature and hours of sunshine, my houseplants often reflect changes in their environment. It takes them time to adjust but they usually recover. Hopes yours continues to improve.
The leaves wrap could be due to transplant shock the plant have to go through. Rubber plant has white sap inside its leaves and stem also. Making soil too wet will prevent nutrition uptake to a stressed out plant. You can keep it next to a Sunny Window and let the top inch of soil dry out before further watering. Spread few fallen Green Tree leaves over the top layer of soil. Let me know if it improves