Advanced Class Guide: The evasive deed shoult not grant improved evasion. (it grants it in PCgen)
_Evasive (Ex): At 11th level, while a swashbuckler has at least 1 panache point, she gains the benefits of the evasion, uncanny dodge, and improved uncanny dodge rogue class features. She uses her swashbuckler level as her rogue level for improved uncanny dodge. _
I'm looking at the Deed in question. It does not grant anything, which is expected since those are conditional upon a Pool we do not track.
Your Improved Evasion is likely being granted from somewhere else.
Evasive is repeated... sigh that's the culprit.
Fixed. To reporter to confirm.