Hi, Mikey.
I suppose your plant could not be cannabis.
Absent stress, pH issues, etc., I am more prone to lean toward the apical meristem being attacked by some sort of fungus, since it is not growing new leaves there per your second pic. It is sprouting new leaves lower on the stem.
Eleven Roses is ~90% indica, which the leaves seem to be.
I would watch the top closely for a day or two for further possible fungal damage. If seen, cut the top off below the fungus and treat with a fungicide. If new leaves grow out the top, let it develop.
Could also be genetics. Even weird plants make good bud!