I've tried to replicate this issue on my own GOS Pixel 10 base and I'm unable to, I've tested across multiple browsers Brave, Vanadium. Certificate of the website displays as normal for me.
Can you upload a screenshot?
Open Vanadium or what ever you use
Tap three-dot menu (⋮)
Settings > Privacy and security > Clear browsing data
Select "All time" as time range
Make sure you check Cookies and site data & Cached images and files
Tap "Clear data"