When Exporting in WebShell, users can Export a list of Query results from the ad-hoc query window. Even though the output in CRM is a list of Yes/No responses, when exported from the ad-hoc query window all responses are No.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.
A few workarounds exist for this issue:
The issue is not seen when using Export functionality in the Administrative functional area
Also not seen when using ClickOnce to access the Ad-hoc query window