Your question is a bit confusing, the tops still look like they are flowering in early stages. By saying its growing again, I'm not sure I follow, cannabis plants can triple in overall size during the flower process so if its growing big fast I'd say it's normal. My outdoor girls have been in the starting stages of flower for about a week, look similar to yours in many ways. I will be starting flower nutes on the first of August and usually harvest in the first two weeks of October. Only way I could see it going back to veg because of a light cycle is if you are or have moved the plant to an area that isn't getting a full light cycle, otherwise, depending on your area, strain, and weather patterns it should be in early flower.