multirobot_map_merge cannot merge the maps, when individual maps are created with different Deltas

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Hi Guys, I have 2 robots in a single gazebo enviorment and I want to create a merged map out of both robots. Both robots are creating there individual maps and the multirobot_map_merge combines the map together.

Case-1 when both the individual maps are created by same delta value = 0.05

Result - Everything works fine

Case -2 when one map is created with delta = 0.05 nad second with delta = 0.03

Result - Map merge doesn't even try to combine the map, rather than that both the maps are seen individually at different position of multirobot_map_merge's rviz

Can you give me some solution for that?