It just may be that the leaves it previously had were developed indoors/in the greenhouse. Sometimes this may mean they are a bit floppy and subject to breakage and drooping. There was likely no wind inside the greenhouse and if the light wasn't that bright, sometimes the leaves are thinner and more subject to breaking/flopping. The new leaves coming, in the bright sun of outdoors, will probably be stronger and look nicer.

On the subject of watering, you mention you water every other day. I know they say bananas love moisture but be careful not to over do the watering, let it dry out somewhat inbetween waterings, especially if the weather is still cool (wet soil and cold temperatures could rot the plant.)

Glen

I'm betting it will recover nicely. They are extremely hardy plants during the summer months.

See my "I've killed ever musa basjoo" thread for overwintering help, though. :-/