DataMart Refreshes

I have two DataMarts, among several, that I have a daily refresh setup for 5:30am. Based on the refresh history the refresh completes as expected within 3 hours; however they start another refresh after that lasts for another 2-3 hours. I do not have any second refresh time set. I have several other DataMarts starting at the same time and those start and end as expected.

They are currently full refreshes, have not setup any increamentals yet.

Anyone have an idea of what is triggering this second refresh?