Can you provide more details, please?
Is the red number three an actual typed character? If so, it might have directly applied local formatting from the original word doc that was placed. What if you select all, and in the Pargraph Style panel, at the bottom, you clicked on Clear Overrides in Selection.
@romankoschka – Object styles simply do not work the way you wish:
Different styles for different text frames are accepted, but with threaded text frames the paragraph style of the object style is not bound to a single text frame.
First you will have to un-thread the text frames, then apply the new object styles, then thread the text frames again…
But this behaviour is not new in InDesign CS6.