Can select only from a few headers in multilang site

Hi, I run a multi-lingual website, using the Polylang plugin. When editing the (main language) English pages, I can select among all the header images I’ve uploaded. In the secondary language, though, I see always the same five images only. Even if I then upload more headers or re-upload the existing ones, I can only see the same five headers. Any ideas how to fix this? Thanks.