my series three watch receives texts, but not all are showing up in my messages app on my watch

Hi

It may help to follow the instructions here, including under the heading "Get help if you can't send or receive messages" in the first article and including unpairing and re-pairing your Apple Watch if necessary:

• Read and reply to messages with your Apple Watch - Apple Support
• If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support

Keep in mind that the functions that are available on your Apple Watch when it is away from your iPhone depend on various factors including:

• Your Apple Watch model:

  Apple Watch - Compare - Apple

• The features of your carrier service plan:
  • Apple Watch - Carriers - Apple
  • Make a call with Wi-Fi Calling - Apple Support
• The type of connectivity that is available to your Apple Watch at the time:

  About Bluetooth, Wi-Fi, and cellular on your Apple Watch - Apple Support

Features and requirements that apply under various circumstances are detailed here, including within the footnotes:

How to use your Apple Watch without your iPhone nearby - Apple Support

If you still need help, then I suggest that you contact your carrier in the first instance. If the issue persists, then, depending on your carrier's advice, I suggest that you next contact Apple Support (remote diagnostics and/or mail-in service may be available, if required), make a Genius Bar reservation or visit an Apple Authorised Service Provider for assistance:

• US: Apple Watch Service Answer Center - Apple Support
• Elsewhere: Apple - Support