total data is double

can somebody help me?
i have data which are tr(trust), marstat(marital status) and dl(education level). they have the same respondens but different questions. when i combine tr and marstat using full join, the amount of respindens is similar which is 33.443. however, when i combine tr, marstat and education level, the amount of respondents is 96.886.
can somebody give me crrection about the incorrect part?
thank you

Hi there! Could you ask this with a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.


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