One source cited twice, citation footnotes form contrary to set style

World Politics is selected as citation style in used text editor.
Some sources cited have multiple authors.
All citation footnotes adhere to World Politics style (inclusively those authored by multiple people), means: "<<name of leader author>> et al. YYYY" - except for one source which is also multi-authored (cited at two points in text). In case of later one the both citation footnotes get the form: list of names of all authors with colon sign as deliminator YYYY. Also these miss the character chain "et al.".

Regarding reference entry data all right if it concerns author inputs. Bad case: first name fields are filled with first name initial, e.g. P - in contrary to good-case: first name fields are filled with full first name string.
Where to search for possible problem reasons?
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