Preflowers but no further progress with GG4 auto

[FortyNation]

I have a GG4 auto in week 9. Usually at this point, autos I grow are well on their way to finishing and at least have some visible flowers. However, this one started forming preflowers about two weeks ago or so, but the flowering hasn’t really progressed any further. For example, I I topped it and did a little LST like I usually do, but all my branches/stems have grown additional nodes since and I have to keep moving the plant ties to accommodate the additional nodes. Is there anything I can/should do to speed up the flowering process? Is there something wrong with tbh is auto? I’ve harvested at least ten autos before, but never had this happen.

Here is my setup

gg4 auto from rocket seeds
3x3x6 tent with viparspectra VP600
ocean forest with additional perlite in 5 or 7 gallon fabric pots
18/6 light schedule
did I forget anything?

 

[Catfish22]

I have an auto now that didn't auto. Had to go to12/12 to get it to trigger.

 

[FortyNation]

Thanks for the response. Did yours have any signs of flowering before you switched to 12?

 

[FortyNation]

Had some trouble getting good pics, but here is the plant and i tried to include a couple to show the preflowers.

 

[Catfish22]

Mine went to 10 weeks before I flipped it partly because I was waiting on another tent.

It started doing the offset segments and instead of buds it just grew a new node. I had topped it so it is a gangly girl but she's making a few nice colas which is better than I expected. She showed pistil hairs like 72 hours after flip.