Dashboard - Index Widget negative value format is not rounding

In Dashboard application, I’ve created an Index Widget. Doing a SUM function on a column defined as Decimal(15,2). When value is positive, the format round it to Thousand(K), Million(M) etc. However, when the value is negative, it shows the full value without rounding it. I cannot find an option to round negative value other than to change negative value font and size etc. Please advise if I’m missing something.

Regards,
Ali_