Lead Conversion Mapping - Matching Field Length Error

I'm trying to map new fields in Leads to Potentials and Contacts. I'm getting an error message that says, "Parent field No of Employees of length 9 should be less than or equal to Potential's field No. Employees of length 5."

When I go into Potentials to edit the field, I'm unable to change the value. I see the following:

When I go into Leads to edit the field, I'm unable to change the values. It is saying it is a system defined value. It is also set to 1, even though we can edit many digits. For example I can enter, 40,000 in the field. I see the following:

I'm unable to change any of the values? If I can't change the values, I can't map ANY fields.

Assumption = The error message says "Parent field". Is it correct to assume Parent field is Leads?

Any suggestions on how to solve this?

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