Strange plant

Aye I'd give it another couple of weeks before deciding. Could be a dud wee dwarf or could be a monster I've had autos do both to me.

Self topped mutation. I grew few nice trees from such start.

I grew around 50 autos over 2yrs and saw a couple just like this but there was little to no difference once they got bigger.

It reminds me of a plant I grew about 4 years ago. It started out slow and when it eventually did start growing, a bottom branch outpaced the rest of the plant and became the new top. I ran it to finish just to see how it would do. It did produce but grew very strange and didn't produce as well as it's sisters. That was in an outdoor grow though and all it cost me was a little ferts and water. Since you're indoors I would recommend moving on to another plant. Indoors, space is a premium commodity. Don't waste it on maybes.

Sieht mir nach einem Gendefekt aus, eine Mutation :)