left join and NA

Hallo R studio Community,

here is my problem:

data_1_5<-left_join(data_1, data_5,  by =c("Paziente"="Paziente Fullname"), copy = FALSE,na_matches = "never")

"Paziente"="Paziente Fullname" , are characters.

Some variables ( numeric) from data_5 are returned as NA in data_1_5.

Any help from the community?

if not every Paziente Fullname matches Paziente I'd expect to have numbers in exactly those unmatched places, because... what number should go there ?

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