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Because the data of OccupancyGrid is of type int8, even if you assign a float32 type, it does not store the value as it should.

The solution is different depending on the purpose of using OccupancyGrid, but for example, the following can be used. Multiply the data in std_msgs::Float32MultiArray by 100, cast it to int8, and store it in the OccupancyGrid. Then divide it by 100 at the destination where it will be used.

ref: http://docs.ros.org/melodic/api/nav_msgs/html/msg/OccupancyGrid.html