Action start date populated incorrectly

Summary:

We have created action plan templates with actions associated to them we require the start date to be mapped to a custom field however when we add the action plan it is taking the current date.

Please can anyone help?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable)
26B

Code Snippet (add any code snippets that support your topic, if applicable):