Looks like your strings are not being Encoded correctly either before output, or on-the-fly during the
output writing process.
Check your session options() and the following help pages (not run):
options("encoding")
# ?Encoding
# ?write.csv (example of on-the-fly encoding)
# ?file
# This GitHub page has a good discussion of the issues:
https://github.com/tidyverse/readr/issues/697
HTH