Small pot?

Yes, I would be transplanting this plant asap into a pot at least twice the size, this will get it through flowering and hopefully give you a decent yield. Pot size has nothing to do with weird leaves, but exhausted soil and being root bound probably will lead to problems with over all health. I would strongly urge you to clean up your grow space, all those dead leaves and garbage are just the invitation pests and disease are looking for! Remember too, the less leaves your plant has, the less energy she is able to make and the less energy, the less the growth. It would have been good if you would have included a picture or two of the "weird" leaves you were worried about, then we could have given you some suggestions! Cheers, Organoman.