Here is a VdB with 3 totally different leaf shapes.
It is a young plant and the growth is affected by many factors that dictate the shape but it still interesting to see when this happens.

my new  black triana is like that. 3 different leaves. nice to see i'm not the only one with weird trees.

 what causes this?

Naw its not weird but common with many types of young plants and reason hard to guess cultivar until their more mature and show a dominant leaf.

I think the VdB is deciding who to become, a Black Madeira, an RdB or stay true to the roots, a VdB :)
Like your teenage kids in high school.

It seems like almost all the cuttings from this year are doing this to me. If I lost the tags I would be in BIG trouble. I can't even compare the leaves on my Petite Negri's yet to figure out if I may have some Petite Aubique. I'm hoping I have both.

Does this nonsense usually clear up the second year or does it take longer?

Looks normal.

I have a few that are doing the same thing.  Luckily, they are all labeled.

greenfig-- if by "interesting" you mean "maddening", I totally agree!!!  As a newbie I sometimes have to throw up my hands and take a wait-and-see attitude and say "whatever, as long as it tastes good."  With all these trees that don't know what to be, I went from having 50% "unks" to more like 75% unks, since I can't trust the labels!  I guess it just goes with the territory...
Jim

That explains a lot. I noticed the same phenomenomonemon......with my sub 2 yr old Gk Yellow, and thankfully I know what it is coz it came off our own tree in Greece. Otherwise, yes, it would have been problematic.

As for being confined to younger trees, I noticed the same prob. with my TbF, which is at least 10 yrs old. Is that why it's proving so hard to ID? 

This phenomenon is why identifying by leaf makes me crazy, as noted above it is not limited to young plants either. You really do need a somewhat mature tree to know more precisely by dominant leaf type but even that is pretty iffy for me. A good reason to source only from reliable folks.