How do I delete unwanted combinations of Department and Sites in the Asset Module

How do I delete unwanted combinations of Department and Sites in the Asset Module

I am using ServiceDesk Plus 7606 with MS SQL 2005. Somehow, in the Assets Module when assigning Assets to department, the filter is showing a lot of combinations of 'Department, Site'. How can I delete those?
In Admin Module both Departments and Sites are ok
 
Thanks for any suggestions
rmo

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