DNS Propagation Troubleshooting on Namecheap

I've been experiencing DNS propagation issues since migrating from Google Domains/Squarespace to Namecheap. While my A records are propagating just fine, my AAAA and CNAME records are not. These records are crucial for my website hosting.

I need a professional to:
- Check my Namecheap DNS settings
- Diagnose the propagation issues with my AAAA and CNAME records
- Suggest and implement solutions to rectify the problem

I've made some modifications to my DNS settings post-migration. Therefore, I would appreciate someone who can thoroughly assess my changes.

Ideal skills for this job include:
- Extensive experience with DNS settings and troubleshooting
- Proficiency with Namecheap
- Knowledge in website hosting related DNS configuration