Android gallery scrolling issue

When image gallery is wider than screen and I scroll it - images is re-loading all the time.

public class ImageAdapter extends BaseAdapter {
.....
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if(convertView == null){
            holder = new ViewHolder();
            convertView = getLayoutInflater().inflate(R.layout.gallery_item, parent, false);
            holder.imageView = (ImageView) convertView.findViewById(R.id.ivGalleryItem);
            convertView.setTag(holder);
        } 
        else 
        {
            holder = (ViewHolder) convertView.getTag();
        } 
         ....
         Ion.with(context)
            .load(holder.imagePath)
            .withBitmap()
            .intoImageView(imageView);  
    }
 }          

I asume Ion is caching image by default but gallery still hide and show it during scrolling.

So, where is my problem an d how to fix?

via Chebli Mohamed