Hello,
1) I did not face mentioned issue https://gyazo.com/2ec2fbdfda04d57d6d99fbedb971bcb8 All the prices are ok after filtering
2) Provide screenshot, please, for better understanding. By default, our theme does not have such kind of messages. Maybe you use some third-party plugin that adds this? Did you try to disable third-party plugins and check if you still have the mentioned message?
Regards