So weird - anyone experience this weirdness on Facebook PPC???

Hey guys, looking for advice from fellow people who buy FB ads.
For some reason, my costs are extremely high, and I want to do a mini case study explaining what I did, and hope someone can tell me what happened.

I started a new camp last night, I will focus on 1 ad that is the best performing.

Product:

• Kitchenware product
• Cost per sale: $25
• Sweepstakes CC submit
• US only

Targeting: (60mil-70mil population)

• Women
• 30+
• US
• Detailed interest targeting
  • 10+ interests ranging from cookware, baking, kitchenware, etc

Ad placements: (ad is a tiktok size video, but cropped when necessary, with text in the middle)
I chose only a few placements that I knew would fit - and are the most popular. But, did this make it much more expensive?

• fb feed, fb video feeds, fb reels
• insta feed, stories, reels
• all audience network
• nothing messenger placements

Stats:

Where "leads" is a LP Click.
But, that is actually false because 13 people made it to my offer page (no conversions yet)
So finally:

• Ad CTR: 8.50%
• LP CTR: 50%

This ad is CLEARLY resonating well with the audience.
I know ads that don't perform well - usually cost more.
But, this seems to be performing really well?
The reason I am so curious - I usually never do detailed targeting, and it seems very expensive.
Let me know guys!