It happens from time to time that the cloudflare x-forwarded-for header (& also the cf-connecting-ip header) have an incorrect user IP.
e.g. google (& all other services) shows my IP as: 2405:205:3084:de6e:5801:cbd2:b2a3:e26
however the x-forwarded-for header says: 2405:205:3084:de6e:60eb:d306:5311:721e
In case it matters: The user who is affected by this is using a mobile phone internet connection.
What could be the issue here?