Please consider that the Image within Post/Page Content is not controlled by the Theme. Your problem may be a Caching Issue. You can show with detail screenshots mentioning what is happened and what should be. Are you sure the Editor is set as Visual Mode ( Not Text Mode ) ? Did you clear the Cache of the Browser ? We can’t regenerate such these problems in our Test Environment. If you used the Extended Version we could check your site taking admin access from you.
