I'm telling you in the picture you posted I can visibly see that the two larger plants are receiving more light the three smaller ones are shaded at best.. re position the light or maybe move the light cone or add a second light
only thing that would really explain it is the amount of light they receive.. other options are mislabeled seeds, poor root establishment, or root constriction.
but if you did everything the same the only two are really light or wrong seed but idk