Hello jcbii and welcome,
You can configure the Monarch page break in the Options > Input menu, the default is every 100 lines and the maximum is about 256. Annoyingly, you can't turn it off, or set it to 0.
To overcome this, you can define your trap as a single line template, and then define a field which starts on line 1 and ends on "none of the above" in the advanced tab of the field properties dialog.
Ok, I think it worked!
I forgot to mention that there was an Account Number & Account Description line that preceded each group of detailed information. So using your suggestion (starting on line 1 and ending on "none of the above" for the particular field in question) was picking up this information as part of the detail lines. However, once I defined the Account/Account Description line as an append template, it was not included in the detail description field. Now it looks like the double-line detail, single-line detail, and append information is being picked up properly by the two templates!
Thanks again for the information. Much appreciated.