Thank you so much for trying the game, and yeah the trait system is one of the things that really need a rework, but for your questions:
Yes, DNA traits count towards the max of 3 traits
Yes, you can stack as many bonus traits as you like, which kind of undermines the whole point of the max trait rule but oh well
And yes the MP is a typo
The next update plans for a rework of the trait system so it's a lot more straight forward to understand. If your friends do decide to play please tell me your experience, especially any parts confusing or frustrating so I can tackle them first!