Admin password during installation of macOS sequoia not accepting

So I can actually login to MacBook Pro 2019 with my admin password which was running on Mojave version 10.14.6 but when I downloaded the new updates so can be able to perform some certain tasks and use other applications same admin password keeps rejecting and I’ve tried restarting the mac severally and nothing seems to be resolved.

The issue is if I forcefully restart it, it will be asking me to reinstall same macOS Mojave which is outdated

please can someone help me fix this issue 🙏