You may wish to have a look at this post, where a user encountered a similar issue with multilingual author names: Language problem with "How to Cite" - #12 by Oleksandr_Radkevych
I suspect that is what is happening here as well.
There was a fix issued for this particular issue here: Author name is not localized in How-to-Cite citation · Issue #6862 · pkp/pkp-lib · GitHub
You would have to apply the patch noted in the Github issue, or update to a later version of OJS (it was included as of 3.3.0-5).
-Roger
PKP Team