Thanks for the reply.
Please be advised that channels on Roku are developed and maintained by the channel developer themselves. We suggest reaching out to Paramount Plus' customer support team to report the issue and get help. There's likely an issue within that specific channel that needs to be addressed with an update from them.
You can contact them here.
Moreover, this thread is only regarding HDR issues within Paramount Plus. If you need further assistance with another issue, please create a new thread for that concern.
We appreciate your understanding.
All the best,
Roku Forum Moderator