I know this has been discussed previously but I have had a similar thing happen, though with a difference. It started with normal 5-7 finger leaves. Its 4 months now and started growing its 3 finger leaves about a month ago. It has been covered in pistols through vegging since 2 months old and is around 6ft tall so far. I did think maybe it was a ruderalis but they are little plants. Its a huge bushy plant. I grew it from seeds i got in some hemp tea lol. Have a look at the pictures and let me know what you think. Cheers.
https://ibb.co/cb9ToF
https://ibb.co/cb9ToF