That is a puzzle but here is a video that might help recover something from them.
How To Recover Stunted Tomato Plants
https://www.youtube.com/watch?v=6EnUsiRSI74
I assume they couldn’t be root bound (small hole in clay soil or whatever) and you already know about all the obvious, sunlight, watering, etc.
They were all in pots the same size with the same soil. (Intermediate homes until I could get them in the garden itself — all except the two “patio” tomatoes of which both immediately went into their final large pots, and one is doing very well and the other is another small weak plant with one largish fruit...)
But... some plants were flowering as I got them and of course it’s a little hard to know if some were more stressed B4 I got them, than others. Most all I started from seed instead are doing very well.
Mostly it seems like some plants started making fruits too soon and put too much “energy” and nutrients into that. I just sorta let ‘em go - maybe should have pinched off the flowers or young fruits. But I’ve ended up with so many “good” plants that I’m not too worried. I was much more aggressive vs. snails and slugs this year and that seems to have paid off. I’ve not lost or had damaged a single young plant to such. :-)