First grow Cinex

Two plant same strain being feed the same and I have two total different out come. The first one is nice and frost growing with no issue even smell great. The second one I don't know🤦🏿🤷‍♂️🏿. I not doing anything different from the other on but it's growing but struggling at the same time. Where the first one is super frosty and smell strong the second has no smell is growing buds but is not frost at all and the leave have been dropping. So what I did was flush the second one and will just feed it ph water and no nukes for about a week or two to see if it get any better.