Map overrides another map that is different

It was just a day of making the most weirdest world in Minecraft. I decided to make 2 maps, both on different locations. However, I accidentally tapped on one of the maps twice, and then the maps combined together, erasing one and making the one I tapped twice double. In the video, there were 2 types of maps, Map 14 and Map 15, but then when doing what I mentioned earlier, Map 14 was completely gone and Map 15 got a map added. This also happens even if the two (or more) maps are in different dimensions. I did do some experiments in Survival, and it seems that it tries to stack the maps, but does not allow it to happen. The maps are all Locator Maps, but the issue also happens with non-locator maps.