3 month old mothers flowering?

Ok i have 2 mothers and all of a sudden they just start flowering, the light cycles stayed the same, I even changed changed it to 24 just to see if it would help at all but it didn't.

How old are the mother plants? - if they are new seed plants they will mostly show flowers when they have like 7-9 sets of leaves. Often they keep producing small single flowers - just a few.
If they really start to flower and create buds you probably have an autoflower strain. Maybe some heirloom strain?
Could be caused by stress too.

Have you given them a strong dose of Potassium recently? Try to make sure all parts of the plants are getting light.