HT4236 Syncing Photos from laptop to iPhone

Hi, I am struggling with transferring my old photos on my laptop to my new phone using iTunes. Every time I synced one folder and start transferring another one, the first one deletes itself:( The folder is created as an album but every time I try to transfer another album, the older one disappears. The album that's transferring at the time appears in Photo Library but disappears also as soon as I start syncing a new album.

I am sure this is a silly problem but I don't know how to fix it, please help.

Thanks a lot

z