The [DESCRIPTION_AND_IMAGES] tag actually works a little different than what you're thinking. That tag reverts picture placement and grouping to the methods used by the one-page lister. This makes the template more like any other Auctiva provided template in use.
The other Image tags are used in combination with the Image Type selection to directly insert them as desired. Using this method, you get exactly the number, type, and placement of images as defined in your custom template.
Using no image tags and just [DESCRIPTION] tag should produce a template where you only see the standard Header, Trailer, and Gallery images on a Preview (that assume you chose a Header and Gallery). Is it possible you are selecting images in the one-page lister for Image #1, etc.? Technically, if there are no tags, you shouldn't get any in the description section. However, selecting one might create some type of conflict bug in Preview. That one's got me pondering.....
Danno