Morning, the plants look great, however you do have 3 completely different strains going. It's very common for the plants to finish at different rates. Even if you had all the same strain, every seed is different and every plant is unique and may take longer/shorter to flower etc. If you see continued new growth on top of the budding plant, or new white pistils when they've already begun to mature and change colors, that would be a good indication of a leak or faulty timer/lights. Also often a revegging plant will have unusual leaf patterns for a while, like basil leaves.
Great job with the plants, just keep an eye out for veg type growth while a plant is already flowering, all her energy should be making buds, not new leaves or new pistils.