Category shortcode not listing more that 10 documents unless pagination enabled

Just evaluating the plugin for a client’s need, we want to list all docs of a specific Category. I have downloaded/installed the free version.

On the Documentation page I found the wpdm_category short code and, not wanting the Search or Page x of y (just list all docs matching in a simple listing) I set the toolbar and paging options to 0 (turn off) and the items_per_page to 100 (list ALL).

This worked nicely until I added the 11th and 12th document matching the Category as at that point the just added documents failed to appear. Only after re-enabling pagination did we get visibility to items 11 & 12.

Next, I tried playing with the items_per_page so see if we could live with a smaller listing of item with Next Page etc so I dropped the items per page from 100 to 5: I refresh the page and we still get 10 +2 on next page, not the expected 5 items!

So here is the initial shortcode I used (originally from the docs web page):
[wpdm_category id="AG,PgmDocs" operator="AND" toolbar="0" paging="0" orderby="title" order="asc" items_per_page="100"
template="link-template-default" cols=1 colspad=1 colsphone=1 async=1]
I then amended to:
[wpdm_category id="AG,PgmDocs" operator="AND" toolbar="0" paging="1" orderby="title" order="asc" items_per_page="5"
template="link-template-default" cols=1 colspad=1 colsphone=1 async=1]

I am new to DM so perhaps Im missing something obvious.

Also, can I get a confirmation shortcode parameter values need to be in quotes? I see a mix in examples of quoted and unquoted. I expect to use “s for any string value but are they also needed for numeric 1 & 0s?