3 weeks flower, wierd spots

so turns out this is the only plant that has this problem, what is it? and why?
whyyyyyyy??

its almost a rust color hard to clearly see in the pictures

It's hard to tell from those pics but I'd start to investigate whether or not you have a pest problem. Tiny little spidermites will live and lay eggs on the bottom side of your leaves. You can find them on near the veins of the leaves and in higher concentrations, but they're very hard to spot if you've never seen them before. You'll notice little white spots, rust colored spots and possibly some discoloration on the tips of new leaves. These guys fuck like rabbits though and can have a whole colony in no time, but at that point you'll see webs and the little bastards crawling on your plant. I'd suggest picking up some neem oil and giving them a spray ASAP just to be sure. THEY SUCK!!!

ok It looks like necratic growth. I usualy see this just after a transplant. Normally it only affects the larger leaves. If you havent transplanted recently other causes of this I have found are underwatering, and over fertilizing both corectible without much damage if caught in time. As for spider mites I myself have never seen plants damaged like yours due to spidermites. Good luck man

yeah actually i just transferd. how logn before they went away