Inconsistent Paragraph Styles Across Pages in InDesign

Your parent page is set to two columns and the text frame on the parent page is two columns. (You only have a text frame on the left parent page, not the right.)

The problem is you are not using the parent text frame--you have a single-column frame directly on top of it. 

I would:

Remove the overrides from my paragraph styles.

Cut the text from the existing text frames.

Delete (DON'T CUT) the existing single-column frames.

Paste the text into the text frame placed by the parent. (Remember, it only on the left page.)

Do all your clean up on a copy of the file, not your only copy.