Google showing duplicate Title Tags for Sub-Categories

OC Version 3.0.2.0

Hi - I am getting a duplicate Title Tag message from Google regarding the sub-categories. For instance:

/Antique-Silver-Goblets
/Silver-Goblets/Antique-Silver-Goblets

Since the sub-category is only accessible via the category menu not sure how this happens or how it can be fixed ?

Any pointers would be appreciated.

Thanks