Leaf anomaly

Any idea what would cause the leaves to look like this? Edges of leaves are smooth, not jagged.
Rather than leaves of 3 or 5, it's growing a single larger leaf. This is a clone from a Blue Dream. About 2 months old.

yeah man, thats a fern or something! lmfao. If I were you I would be more concerned about the other plants that are suffering and about to die... are you feeding them?

from the looks of plants in background you have sum serious problems, the plant in question IS POT you can tell because the lower leafs of thta same plant HAS SERRATED EDGES jesus christ guys, come on, open your eyes.
the plants in the background look unhealthy as-well
whats your light setup? soil/hydro and nute regime
the ones in the background almost look like nute burn =/
we need a few more photos and more details of your setup
and 2 months old it should be alot bigger than that, but they dont look stretched for light so yeh, MORE INFO/PHOTOS

dunno why i didnt pick it up before, those plants appear to be re-vegging, seems like the "clones" you got were taken from a flowering plant, it would epxlain the weird leaves AND the fact that it is 2 months old and fairly small as it had to convert.