I think it's just a reaction to the cold rain. If the leaves are still stiff and springy, it's not a problem. Mine do the same when they are put outside to start hardening off. When they first go out they have wide, flat leaves but the first cold rain of their lives makes them take on almost an umbrella shape. As long as they aren't actually wilted from the soil being too soggy for too long, they're fine.

yes i have seen it and it looks like a frown almost doesn't it? Definitely an 'unhappy' expression on those leaves!

phew, thanks so much!!!!