It seems you are using dynamic widgets plugins . Please refer this video tutorial on dynamic widgets.https://www.youtube.com/watch?v=3Mvpx-y3WaQ
And you can check following things to fix your issue:
Go to dashboard -> widgets -> Footer widgets areas -> text widgets -> below the content area we can see “Dynamic Widgets: Dynamic” click on dynamic string you will be forwarded to dynamic widgets edit section.
1> On pages section you need to mark Yes for “Show widget default on static pages?”
2> Setting posts pages control rendering of widgets on the place where your post are listed. So checked yes to render on posts page.
Note: If you feels difficulty on using dynamic widgets we refer you to use jetpack widgets visibility module by Jetpack. Here is the tutorial: