Hi Max,
Although I have been out of it for awhile I used to have some
experience with indoor growing. There is information on this forum that would attempt to have you start seeds outside and entirely forego the indoors, I agree with this but I think everyone must take there own path to get to these conclusions and starting seeds indoors is a great way to learn and observe the plant life cycle.
I will try to help to the best of my ability, my question is what kind of
lights are you using and have you checked what spectrum of light they are giving off? Plants need a diverse spectrum of light or else they will not grow properly and you will run into such problems as you are experiencing.
The plants likely think that they are being shaded out by some other plant and are growing as fast as they can to get to better unfiltered light, which of
course in this situation they wont find.
Anyhow that is where I would start hopefully this is helpful, and good luck.
*edit* also after checking the pic again, to maximize your current lighting I would build some kind of mini enclosure out of mylar or some other reflective material so that more light gets to the plants and is not lost to the room.
More questions what is the ambient temperature of the room? Where did you get your seeds? What is the substrate/medium you are growing in?
Daniel