Abyssinian banana

I have an Elsete ventricosum which I overwintered in my workshop. The frosts are over so I have brought it outside in its pot, but it seems slow to get going. After removing the leaves that had died during the winter, it started pushing up a new leaf but after 6 inches it has buckled over. There is another leaf forming inside but this also looks malformed. I have attached a photo. Any ideas anyone? Root disease? Malnourished? Bugs? (Can't see any).
Also, I remove the dead leaves but never sure how far back to cut. As you will see, there is now a lot of black dead material around the stem. Should this be removed and if so, how far? Do I expose the green stem?

 

They do produce a few miss shapen leaves to start with, but I think things should get back to normal when the weather warms up.

 

Thanks Pete. How about the dead leaves? Do you remove the dead all the way to the base? I tried it but there was lots of water and the green stem felt like I was skinning it.

 

No I just cut off the dead part.
It is the leaf stalks that combine to create the stem.
You can remove any dead material.

 

Thanks Pete.

 

Judging by the sack barrow, that's the size of the one I lost because of the BFTE a couple of years ago. I don't tend to get them outside too early now, just in case we have another cold snap. But also, when they get to that size, you don't want to be lugging it in and out every other day!

 

It's back in the workshop now until it stays warmer.