FlexPro needs to determine one data type for all values. This is normally done from the first row/first column of the selected area. Please check if your selection contains strings in the first selection row. Unless you do declare them as titles for the dataset(s) they will cause the target data set to be of type string.
In general you should select the exact area of your data (empty cells are skipped) to get the best results.
Please see also the following topics in the online help:
[list]
Tutorials/For Newcomers/Getting to know FlexPro in just 15 minutes/Importing Excel Data
Managing Data/Excel Workbook and sub-topics
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