I'm trying to produce a reverse version of a logo (see the palm tree logo on the left side of http://www.themightykahunas.org.uk/).
Given that the logo has some text which needs to stay the right way round, I've used the clip tool to take out the text and then I've rotated the palm tree to face the other way.
What I want to do now is put my copied and pasted text area on top of the mirror image text so that it looks exactly like the original but with the palm bending the opposite way.
The problem I am having is that the text object has an unwanted grey drop shadow (I think, at least a grey border on the bottom and right side) which puts an ugly line in the middle of my image (underneath and to the right of "Kahunas").
This is the offending image:

I have searched and tried everything I can think of to get rid of this, but have got nowhere.
The following have been tried:
Setting fill colour to black
Setting stroke colour to black
Turning fill and/or stroke colour off
Ensuring stroke width is 0px
Deselecting the image - it still shows
Removing all filters to remove any shadow effect (though none was applied in the first place)
In document properties removing borders/shadows
Any ideas? Any assistance will be very greatly appreciated.
Many thanks,
Chris