Under preference I've set my default snipe to 3s but on my items that I have set up a snipe my snipe is still showing as 10s why?

Hello Colin,
Thank you for your question about your lead times. The preferences setting will apply to any future snipes you set. If you want to change the time for existing snipes, you must re-add the snipe.
Thank you for taking the time to write in. Please let me know if I can help with anything else.