On your computer, what is the regional setting for the decimal separator, is it Period, which is used in the USA or is it Comma, which is used in some EU countries? If you use a Comma for the decimal separator, try changing it to Period.
What version of ANSYS and SW are you using, maybe this bug was fixed in a newer version of ANSYS/SW.
Regardless of that, you will have to manually edit the materials in ANSYS Engineering Data after import and check each value carefully, making corrections as needed.