Okay, give us some info. How old are the plants? How many plants are there? How often do you check up on them? What type of bulb is that 60watt? Also list the pot size, soil, fertilizer used, location specifics, temperature. From what you have posted I gather that there are a few plants getting almost nothing for light so they are constantly trying to get near it and are screwing themselves up. You need to upgrade your lighting ASAP. Those new seedlings are going to stretch again for the weak light source and fall over.