I got my domain and ssl(sectigo) from bigrock and my ssl will expire after 2 months , and my backend (node express) is hosted in digitalocean and my ssl certificates are configured correctly in my VPS/droplet and my front-end service is hosted in vercel and now when I open my website it says site not secure and ssl expired but when I checked big rock it shows it will expire after 2 months. I am using my custom domain and when I used dig commands in CLI the results were absolutely fine for A, cname, _acme_challenge. Now I have not uploaded ssl for front-end from my side ( the one I got from bigrock(sectigo)) and I am getting let's encrypt ssl expired.

