Citations in-text seem completely random

I need help in formatting my in-text citations.

As in the last 12 years working with endnote, I have set the settings to “If ‘3’ or more authors, list the first ‘1’ author(s) and abbreviate with ’ et al’.”

And I do that for both first and subsequent appearances.

Now I want to do an in-text citation with four authors -> endnote cites the first three and then uses et al.

as

“David, Frank, Ha, et al. 2015” (but I want it obviously to show as “David et al. 2015” (which has worked that way in the last 12 years). [I also do not want the comma before et al. but it shows this anyhow]

I tested other references with four authors and they are shown with 2 authors et al.

as

“Ezling, Robert, et al. 2007” [I also do not want the comma before et al. but it shows this anyhow]

However, a reference with five authors is correclty cited as

“Dattan et al. 1997” [It only abbreviates with et al. but not with “, et al.” as I want it]

yet another one with five authors again gets abbreviated with after two authors with et al.

Is this a bug? It seems the in-text citations are completely random.

I have been using endnote for many years submitting to very different journals and using different styleguides. This is quite weird and I could not help myself through playing around with the settings.

Dear Leanne, thanks for your quick reply. Please see the output style in the attachment (zipped).

Chicago 16th Author-Date.zip (2.56 KB)