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View Phase Filter = Show Complete?
...or overlapping geometries?
...or several pieces of geometry that have the "Default" Material assigned to them or are missing their Appearance Image.
Given how the pattern of colour/grey seems so consistant and it only affects the bench, I'm inclined to say this is something to do with the material assigned. Have a look at the Appearance tab of the material assigned to the bench and check those settings.
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