Should this 1 leaf worry me?

I have this 1 leaf doing some crazy shit.

It's affecting more than just the 1 but only on one specific spot.

There was recently a fan oscillating really closely to one side of the plant.
Possibly the side this leafs on.
I'm not sure as I'd already pulled it out and rotated her a few times.

Also I'm losing a lot of my bottom leaves
I am on day 9 of flower
I get that they will fall off eventually but these guys that are falling look HELLA rough
What did i do to cause them to be so shitty?
Trying to avoid these mistakes by learning now

Other than the few leaves with the mangle the rest of the plant SEEMS to be ok
Just watered tonight with 2 gallons of water
Any help is appreciated

O other info may be pertinent
1000 watt HP's
Ffhf soil 5 gal air pot
Ff basic trio nutes
Following website feeding schedule but doing half dosages
So it called for 3 ml so she got 1.5
Before this watering tonight
Received nite feedings past two waterings.
Scheduled to get nutes again next feeding

Any help is appreciated
Or advice on what I'm doing wrong
Thanks

So nervous I'm gonna open my room tonight and going to be death or decay

Giving your girls cal-mag? Also your plants are switching which nutrients its prioritizing for uptake from nitrogen to phosphorus. Some leaves falling of is normal. Keep an eye oh her and dont freak out. Alot of people have killed there plants over correcting