Ah I've seen this.
Very exciting
So, 1stly. Before those seedlings flip they need to be uppotted to their final pot.
It is good to start them in small pots. But the transition into bigger pot should be into a new pot without and disturbing the soil Mold it should have (mold as in its shape its hoding) and the roots should only be coming out at points at not up the walls/sides.
So uppot with the next few days.
So look it up
But to me. You have 2 options.
Clip the runt as there will be a runt. Its still 1 plant. So this will probably be a better route. And if you want another plant just do another
Now there's learning experiences from this that'll throw up that will be priceless to your understanding and experience. And ill say this again. Experiences like this a rare. And plants with issues fixing them and getting successful grows will only help.
So no mater wat way you go. You'll learn..
Me its a 1 in a million and I'd grow it for the fun of it.. so u wanna go ahead while they're young and uppot soon link to sticks so you can train them apart like a V. If 1 grows much slower in rhe next few days. And shows its taking energy to just do 1 good 1 and have no others going and want a good yield. Kill the runt. But it'll be a great grow if they have good even growth just train them away from each other.
Very interesting to see how this works out if u keep