I use the CFs email product to forward emails for my domains. For this one domain the DNS settings keeps reverting to what they were before I enabled the email product, effectively disabling it. The MX record is reverted, and the SPF that CF adds is removed, causing issues with email delivery.
Maybe it happens because I edit the SPF manually to add an ipv4:-value? The SPF is valid, but maybe the Email Router product somehow detects the SPF has changed and disables the product and revert to old settings?