Iphone makes all other devices disconnect from Wi-Fi?

Recently bought an iPhone 6s and connected it with my mac, now every time I connect to my Wi-Fi with my phone every other device disconnects including the mac. When you I try to connect them again it says password is incorrect. It does it with everything. Ps4, my girlfriends s6 literally everything else using the Wi-Fi gets kicked off and can't connect. Then as soon as you disconnect the iPhone from the Wi-Fi everything connects and works fine.
Can anybody help?
Has anybody had this problem?

Sounds like a bad router.

"bought an iPhone 6s and connected it with my mac"

Huh? What the heck does that mean? And how does that have ANYTHING to do with this Wi-Fi question?

Do a >>>HARD<<< reset of the Wi-Fi router.
Your router's user's manual will explain the way to add a new password to the router.

If that doesn't solve the problem, explain in GREAT DETAIL what you mean by "and connected it with my mac".

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