Hi Shelby,
Thanks for posting in the community. We are happy to help you.
For "the date column automatically populated a days old column", I assume you mean the date column will populate the value in another column. If my understanding conflicts with your meaning, please point it out and provide more details (like screenshots) for us to better understand.
If so, the 'date column' might be a lookup column or a calculated column. You can check the column type of the date column that works well. Go to the list> Settings> List settings, under the Columns section. If the 'date column' is indeed a lookup column or a calculated column, you can rebuild your date column. Also, please check if the referenced date column is enabled "Date and time".
We look forward to your response. Thanks for your cooperation.
Sincerely,
George | Microsoft Community Moderator