If you've made recent DNS changes to your domain, you might expect these updates to be applied right away. However, all changes to a domain's DNS records take time to propagate across the internet - usually 24 hours or less.
While waiting for full propagation, you can continue working on your website by using the preview URL if your domain is in the process of being pointed to Hostinger. Alternatively, you can edit your computer's hosts file to temporarily map the domain to the new IP address.
Rest assured that everything will work as intended once propagation is complete. If you still encounter an outdated version of your website after this period, you can flush your DNS Cache.