It sounds like your iPhone might be having trouble syncing your contacts. Here are some steps you can try to fix this issue:
1. Restart Your iPhone: A simple restart can often resolve temporary glitches.
2. Check iCloud Contacts Sync:
- Go to Settings ➡️ [Your Name] ➡️ iCloud.
- Ensure that the toggle for Contacts is Set to ON. If it is, try turning it off and back on again.
3. Edit a Contact: Open the Contacts app, select one of the affected contacts, tap Edit, and re-save the contact. This can sometimes refresh the link between the contact and the Messages app.
4. Sign Out and Back Into iCloud:
- Go to Settings ➡️ [Your Name] ➡️ Sign Out
- Sign back in and ensure Contacts is enabled in iCloud settings.
Axel F.