Apple Watch 3 doing strange things

• On your Apple Watch, tap Settings > General > Reset > Erase All Content and Settings. 
• Type your password if prompted.
• For GPS + Cellular models, choose to keep or remove your cellular plan.
  • If you want to pair your Apple Watch and iPhone again, keep your plan. 
  • If you don't want to pair your Apple Watch and iPhone again, remove your plan. If you aren't going to pair with a different watch or iPhone, you might need to contact your carrier to cancel your cellular subscription. 
• Tap Erase All to confirm. This resets your Apple Watch to the factory settings.

Watch app on phone;

Tap on accessibility and turn off zoom.

And;

Unpair and erase your Apple Watch

Double-tap the Apple Watch display with two fingers to zoom out.