A donor has been awarded a contribution-based membership at a higher level. Within the renewal window, said donor gives another gift, but the amount is not high enough to reach the current level of membership. A user may also notice that the a downgraded contribution based membership may not pull into the Membership Contribution process.
Contributions based memberships were not meant to show downgrades within Altru. There is not a way to downgrade contribution based memberships.
We recommend to run the Membership Contribution process only once a day, and place it on a job schedule. The process was only meant to run once a day, and running the process multiple times in the same day can cause payments to not be included in the total.