Hello sawsan627,
Thank you for reaching out to Apple Support Communities.
Have you restarted your Apple Watch and iPhone since you first noticed this? Even though it is a simple step it may help:
"Restart Apple Watch
- Turn off your Apple Watch: Press and hold the side button until the sliders appear, tap
, then drag the Power Off slider to the right. - Turn on your Apple Watch: Hold down the side button until the Apple logo appears.
Note: You can’t restart your Apple Watch while it’s charging."
More details can be found here: Restart Apple Watch
If the issue persists, can you provide a few more details? Are you currently connected to Wi-Fi? Is your Apple Watch on the charger? Also, which iPhones are you attempting to pair your Apple Watch to?
Cheers!