Hi @Principles77,
Welcome in the Community !
The Custom design platform uses the Coordinate-Exchange Algorithm to create designs based on random points, and then move the coordinates of these random points to improve the design based on defined optimality criterion and converge to a specific design.
LinkedIn post on this topic : https://www.linkedin.com/feed/update/urn:li:activity:7163071856332234752/
The "stange" and very precise values you see are a result of this algorithm computation.
When you make your datatable, you can always change the format of the column and limit the number of decimals (double-click on the factors column, click on Format and set the "Fixed Dec" to the number of decimals you want) :
Hope this response answers your question,
Victor GUILLER
"It is not unusual for a well-designed experiment to analyze itself" (Box, Hunter and Hunter)