After Import, Problem with WP Posts' URL Aliases

I could import one of my wordpress (WP) site to drupal with the help of WORDPRESS IMPORT module.
But, now there is a problem with the url aliases. I am trying to tell it in an example:
A post in WP site had the URL : http://example.com/?p=214
After Import the URL becomes: http://example.com/%3Fp%3D214
While in the Path Aliases list it shows correctly : http://example.com/?p=214
Will you please tell me how to rectify this problem!