Shiki did not eat the Gravity Fruit. He ate the Fuwa Fuwa no Mi, a Paramecia-type Devil Fruit that allows the user to levitate him/herself and non-living things into the air. "Fuwa fuwa" means floating lightly, airy, or fluffy in Japanese. He cannot control Gravity in general (similar to Blackbeard’s ability).
Shiki can only make himself and objects (non-living things) levitate after touching them once, regardless of how heavy they are in reality.
Source: One Piece Movie 10, Chapter 0 – Strong World
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