When I’m on my safari on my iPhone it shows up on my iPad. How do I stop that?

You are clearly seeing Apple’s Continuity service at work - this being intended to allow you to start an activity on one device - and seamlessly continue on another.

You can find details of all the Continuity services - and how to enable or disable them - here:

Use Continuity to connect your Mac, iPhone, iPad, iPod touch and Apple Watch – Apple Support