Hi All
Wondering if anyone can shed any light on this. 2 of our websites have several domain name aliases set up how our hosting company has instructed, through their control panel...

www.samsaraexpeditions.com aliased by .co.uk, www.samsaratravel.com and .co.uk
= Here www.samsaratravel.com has never had a site in it's own right and is coming up ahead of the main site it is supposed to be aliasing in the search results for many pages.

www.snoventures.com aliased by .co.uk and www.edass.com.
= Edass.com never used to come up (although it was the original domain we started with 8 years ago so has IBLs) but now it is coming up in Google results.

We also often get 2 of the same pages appearing next to each other in the SE results even though they are the same page e.g. www.snoventures.com/ski-chile.asp and www.edass.com/ski-chile.asp

Q. Can anyone tell me if the aliasing is set up correctly?
Q. Could end up harming us for dupe content?
Q. Do we need to change anything to eliminate risk of being penalised by the SEs?

Any help much appreciated