If you do a show inventory does it truly show up as a 10GB SFP, or are you just concerned because the interfaces show up as TenGigabitEthernet even though it's populated with a 1GB SFP? If the latter, no worries as it is by design.
Getting Started
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: