First and subsequent author names

I'm using the following citation code: <citation et-al-min="4" et-al-use-first="1" et-al-subsequent-min="3" et-al-subsequent-use-first="1" disambiguate-add-year-suffix="true" disambiguate-add-names="true" disambiguate-add-givenname="true" givenname-disambiguation-rule="by-cite" collapse="year">

Why does are the first and subsequent results for citations different for authors with who share a family name AND same year?

If I have two authors J May 2000 and Q May 2000 in the first instance they show as (May 2000) and (May 2000) but on subsequent instances they show as (May J 2000) and (May Q 2000).

I would like the subsequent style to be shown on the first instance as well.

Any ideas?
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