Doom doesn't need Sig's. And, I second what @Thicco_Mode said
and? that's a very even spread. obviously, there's something not correct with he skill sig stone number. you got 58 mystic, science, mutant, and cosmic in total. if we assume you got 15 tech, which is reasonable, that means you got 17 skill. no idea what you're complaining about
Im sure that you didn't actually get that many skill sigs - when things go into your overflow there is a random multiplier thing that ruins the data - like when you open 4hour crystals and it says you have 300 l2 pots but only have 40.
Now that think about it, it might just be a bug