Please follow the steps below to have a try.
1) Update your Xmind APP to the latest version;
2) Open your mind map on Xmind for Android > make some changes in the mind map;
4) Go back to save the mind map;
5) Transfer your mind map to your desktop and then open it with Xmind for desktop.
If it doesn't work, please send feedback with the file on Xmind for Android(Help > Bug Report).