How to fix php.ini restore default settings in some domain?

    Hello,
    I have one domain in imscp.I enable php function in this domain.I change "PHP post_max_size" and "PHP upload_max_filesize" these two vault in php settings.
    And I click close php settings.Then I click "update" button.But I click php settings again.I see these two vault it's default vault.It's don't show my change vault.


    I have test another domain.It's don't have this problem.I think maybe have some error in this domain.How to check and fix it?