Hmm Deformed??? Should i be concerned

Hey There,

I have been an avid reader but this is my first post. I have a very healthy 3ft plant she has tons of beautiful tops leaves are all very healthy. This morning i noticed that one of my leaves looked deformed. It seems as if the (middle finger) leaf has formed a bowl or cup. The vein in the middle of the leaf acts as almost a stem for this odd shaped leaf. Just thought id post a pic and see what you all thought.

The topside closests in the picture is actually fused together. That lil cup is water tight............Ill get more pictures in a bit. Thanks for any input.