Improved maintenance of "Customer Request Type" custom field

We've been using the service desk for a while, and have been trying out different configurations.

For some reason, the service desk has created multiple custom fields of type "Customer Request Type". All of them have the same description, and say "Please do not remove"

Service desk should not create duplicate fields of this type, or if it does, then it needs to provide you with a way to maintain them, and to distinguish between when/why they were created.

See attached screenshot - how am I supposed to manage this? Is is ok to delete them, even though it says not t?

These fields are confusing users in the search screen, and make it hard to write custom scripts, etc, as it's unclear which field is being referred to