Python.org admin Sponsorship detail - "Renewal" check box does not save

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Describe the bug
When I enter a Sponsorship detail page (e.g. https://www.python.org/admin/sponsors/sponsorship/608/change/) and check the "Renewal" box and then save, and finally move forward to the approval page by selecting "Generate contract for signing", the Renewal check box at that stage will be unchecked.

To Reproduce
Steps to reproduce the behavior:

1. Go to a Sponsorship detail page e.g. https://www.python.org/admin/sponsors/sponsorship/608/change/
2. Check the box marked Renewal
3. Select "Save and continue editing"
4. Select "Generate contract for signing"
5. Renewal check box will be unselected

Expected behavior
Either:
A) When Renewal checkbox is selected on the sponsorship details page and the change is saved, the Renewal box will remain checked on the approval page
B) There is no option to select "Renewal" on the sponsorship details page; the option to select "Renewal" only appears on the approval page

Screenshots

@ewdurbin

Reproduce the issue from the sponsorship detail page at /admin/sponsors/sponsorship/608/change/ by saving Renewal and selecting “Generate contract for signing.” Trace the transition to the approval page; done means the selected Renewal state is preserved, or the interface consistently offers the option only on the appropriate page.