Sea level rises during a glaciation because glaciers are pushing down on the crust, which deforms the ocean basins.

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During a glaciation, sea level actually falls as a significant amount of water becomes locked up in ice sheets on land. As the ice melts, sea level rises, but this is not due to the glaciers pushing down on the crust. Instead, it is a result of the added mass of water being released back into the ocean. The deformation of ocean basins due to glacial push is a relatively small effect that does not play a significant role in sea level rise during glaciations.

Sea Level Rises During a Glaciation Because Glaciers Are Pushing