Cannot get shortcode to work

I am trying to use the following shortcode on a simple page to pull in a specific item type but it will not work properly. It pulls in some of items I want but it also pulls in items of an unrelated item type. I also tried using the id of the item type but I get the same output. I am running omeka 2.3 and simplepages Version 3.0.5.

[items item_type="photographs"]

photograph may be singular?

It’s also worth checking capitalization, Photograph vs photograph, and Photographs vs photographs.

I tried all those variations (singular/plural & capitlization) but I get the same results. The item type name is “Photographs”.

Do you try to upgrade to Omeka 2.5, or at least to the last version of the plugin (3.0.8)?