Wrong order of year suffix in in-citation/bibliography

Hello,
I have several references (web pages) that have the same publishing year and author.
I am using Cite Me Right Harvard 11th version, so when I add those references, the year suffix is automatically added.
But the problem is the suffix order is not correct.
It seems to me that the suffix is attached according to the title in alphabetical order, which is fine. But in-citations and bibliography show those references in a messed-up order. For example, in the case of in-citations, it comes up like (Truman, 1952c; 1952a; 1952b). What is the issue here?
Thank you in advance.
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