Skill point exploit?or normal

Hi,today i see player what have 72% sklill points in one tree in 2 tree have 51% and in 3 sklill tree have 31% sklil points its gunner how is this ??
Its bug or exploit or normal ?i play Flak and i have in one 50% and in other 50% what is wrong?

So… Thats 150%

Maybe it is a bug where they respecced just before you inspected them?

Or they might be low level with a really good class mod?