On my S22 Ultra WhatsApp won't update to the newest update. Yet I've uninstalled it and tried and even reset the whole phone! And it still won't update? Yet Google play store shows the newest app but doesn't show it on my app.
And my WhatsApp has a glitch in the green bar at the top. Every time I click on a chat, in the green bar it glitches white for a military second.
Yep - contact WhatsApp Developers via email address in the Google Play Store, WhatsApp address.
Likelihood is that there is a glitch at their end stopping your device from updating (assuming that there is an update for your actual device available).