Help me understand 2 way

Hi all, I’m an improved so go easy,

I’m currently struggling with 2 way lighting. I’ve got a problem with 2 circuits tripping on a fresh rewire, I’ve got a 2 way at the bottom of the stairs then a 4 gang at the top of the stairs which one of the switches is a 2 way and then got another 2 way across the landing and it trips both circuits, is there any beginners guide or something that can help me understand what the problem is

Thanks