The location where you tap "Create Map" is different for the center of the map. To replicate, activate a locater map and see where the marker is.
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Are you saying that when you create a new map, you aren't always at the center of it? If so, I don't think that's a bug. Maps are actually fixed to the world and cover a specific area no matter where in that area you are when you first create the map. It does not create an NxN map centered on where you are standing.
It's like standing in Sacramento, CA, USA and "creating" a map of California. Your marker will be north-central on the map. Standing in San Diego and creating a map would give you the exact same map, but your pointer will be far south. Minecraft maps are fixed like maps of US states are.
Sorry if I misunderstood the issue.