Well, there's a lot to dissect here regarding double standards.
Let's start with the obvious...Paige had a lot of negative strikes against her prior to this. She has been reported as having attitude problems, she's had mounting injuries, she's aligned herself with someone who the company has beef with, has made appearances alongside him at rival companies events, and has failed 2 (of a maximum 3) wellness strikes. So before anyone acts like this is the same thing as Seth, it totally isn't. Seth had absolutely perfect marks from everyone in the company, and was well on his way to being champ (thus holding MITB) before his enraged girlfriend posted those images.
Back to Paige... even with all those strikes against her, the fact that the Rock and WWE studios were making a movie about her family, indicates that their intent was to mend fences and move in a positive direction with her after this all got sorted out.
BUT...then this happened.
This is a difficult situation to handle. Triple H's rationale for why Chyna can never be in the Hall Of Fame is because his daughter's couldn't google her....well. Sex is normal, it's human, we all do it, and yes it was her private property that was stolen, so obviously she shouldn't be fired for that, at least not initially.
But then as the leaks went out, things got more questionable. Her having sex with Brad is one thing, he's not even with the company anymore.
The two that are gonna be problematic, are the one of her and Xavier with Brad filming them, because while it's none of our business, it has just taken the image of one of the most squeaky clean personalities on the roster, someone who is HEAVILY invested in, with merchandise, up up down down, the cereal, the ice cream, now hosting WrestleMania, and totally damaged his perception. Whether it was personal, stolen, whatever...it's out there now. If Donald Trump did something questionable in secret, and it later leaked, would the country just accept it and move on because they weren't supposed to see it? Clearly not, because that's not how it works in real life.
I think far and away the image that has killed her career though, is the one of (presumably) Brad Maddox, blowing his load on the NXT Women's Title. If Vince was mad about Medusa/Alundra trashing the belt on TV, could you imagine how incensed he must be over this one? This is a disgrace of the symbol they use to signify the employees they put their most faith in. I highly doubt it's the first time something like it has happened, but it is the first time it's happened publicly.
So, do I think there's a double standard if Paige receives repercussions that Seth or Xavier didn't/don't? Not really. Because she had already been on the thinnest ice imaginable before any of this happened, where as the two of them had been model employees up to the point their incidents occurred, and even what they did in their respective leaks, don't really compare to hers.
Do I think there's a double standard in the amount of attention this is getting, versus Seth's? Probably, but then again, Seth's was only a couple of pictures of himself, not engaged in the act, and realistically WWE's audience is primarily made up of young heterosexual men, so of course it's going to attract more attention, that's just human nature.