Ubuntu 22.04 with Mate added on, Power Menu set to turn off display after a time, turns it off but it comes right back on

You’re off-topic here, as this is a Ubuntu site, and not a System76/Pop_OS site.

If you refer the Support and Help Start Here page you’ll read

where Pop OS! is NOT a Ubuntu OS; it’s only Ubuntu based.

I suggest you re-read the Start Here page, and please open the "Before asking a question area.

I’ve thus CLOSED this question, as it appears to be about a Pop OS! system, and not a supported Ubuntu product.