Sotry if this is a duplicate issue but searching didn't turn anything up.

Since bedrock edition was released and I could transfer my world, almost all existing maps get blanked. For example my world has a 25 map wall. All but 7 of the maps are blank after the world transfer. The maps are all differant since you cant stack them even though they are named the same. When you try to look at it, it turns into a zoomed in version of the spawn map.