Automatical adjustment of photos in LR mobile

Are these images raw images? If so, this is normal as before you were seeing a preview of the raw data embedded by the camera and only after switching to edit do you see the interpretation from the Adobe raw engine which by default is fairly bland. One thing to do is to change the raw default (it's in App settings->Import) to "camera settings". For many cameras this will mimic the rendering style of the camera. This applies only to newly imported images. For already imported images just hit reset and it will apply the camera settings thing if you changed the raw default.