plugin not save modifies

hello, i ve a strange problem:
if i login with administrator role, all works fine.
But, if my client login with his role (store manager) , when change any product status from published to draft, the plugin say “notice! saved” and seems all ok. But when change page, all modifies are gone….seems that only administrator role can do modifies…it’s possible? maybe there is an option to fix it?

thnx