Incomplete picklist in custom view

Incomplete picklist in custom view

We created a additional request field type picklist named "Owner" with 65 items.
When we create a request this field is correct usable. But when we want to make a custom view in our request and we want to select on this "Owner" field there are only 23 items selectable.
We are using 8004.

Best regards,
Mark Flothmann

Custom view selection :


Request view :












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