Previous albums deleted

[bigpom]

I have recently downloaded several photos from my PC to my ipad using itunes and, even though I created different albums for each section (Holidays,kid's party, etc.)on the ipad I found that I could load the first section OK but each susequent section wiped out the previous album.I think I am making a mistake in the settings; can anyone assist please. I am using a Win7 PC and syncing the photos to an ipad 2.... bigpom