Yeah, it's probabely from seed, if it's even an actual og kush, which it probabely isn't. Those places will change the name of anything to a kush to make it sell better and to get top dollar, I wouldn't trust them.
The strain that comes to mind when I think fresh lime and skunk, and fuel is Utopia Haze. I have lots of lemonny strains, but the Utopia is the only one that really reminded me of lime.
I hadn't smelled anything with an actual lime smell until my Sour Lifesavers...Lemons, citrus, lemon-pinesol cleaner smells, sure, but never actual limes. He's a male and that's alright by me