Hello,
I have tested this scenario on my test setup but i could not replicate the issue. it works fine for me.
this could be third party plugin.
Please goto plugin page and try to deactivate all 3rd party plugins. and check if it resolves the issue. then activate plugins 1 by 1 and check which plugin is causing this issue.
once you are done with identifying that wicked plugin. i suggest you to not activate that plugin.
please let me know your response if it works or not.