Why is the posting date changing for certain contributions?

When you post a contribution, the posting screen changes the date of the contribution to another date.

This happens when the fund to which you are posting has a start date or an end date. Start and end dates limit the dates that you can post contributions to some funds. If you try to post a contribution before the start date or after the end date, the posting screen will change the date.

To resolve this issue:

1. To see the fund start and end dates, go to Offering → Funds.
   The fund list will show the start date of each fund. 
2. To change or remove the start date, you can edit the funds using the steps in the linked article.
   How to edit a fund's details