Problem with gallery format.

ok buddy here is what you need to do just go to the post editor and edit the post you want to show as gallery now choose the format as gallery from the right hand column i see you alredy did that but you forgot to put the gallery in the post and rather you just added the media one by one into the post.
You need to do this>>post editor>>add media>>gallery>>create a gallery>>add it to your post save the post and that should work fine for you thanks 🙂

Hello Koh !
We have checked your site, you still use the older version of the theme. Please download the latest version 1.1.4:
URL: http://designwall.com/wordpress/themes/wallpress/

– Also,I see the site saying: “Your backup folder MIGHT be visible to the public  To correct this issue, move the .htaccess file from wp-content/plugins/wp-dbmanager to C:/xampp/xampp/htdocs/wordpress/wp-content/backup-db”

The wp-dbmanager folder (likely in your wp-content/plugins folder) has a file called htaccess.txt
1. Use FTP and download that file to your local computer
2. Then still using FTP upload that file to the /home/websitename/public_html/wp-content/backup-db folder and rename the file .htaccess
Related:
Uploading WordPress to a remote host
Regards,

Hi koh yoshida,
To resolve this issue please following my instruction hrere: 
1. Open jquery.custom.js file in /wp-content/themes/dw-wallpress/assets/js/jquery.custom.js
2. Replace following code –  form line 293 to line 322

 $('#content').infinitescroll({
 loading: {
 finished: undefined,
 finishedMsg: "<em>Oops, no more pages to load.</em>",
 msgText: "<em>Loading more items</em>",
 speed: 'fast',
 img: 'http://i.imgur.com/QrOjF.gif'
 },
 navSelector : "div.navigation", 
 nextSelector : "div.navigation a:first", 
 itemSelector : "#content div.item"
 },function( newElms) {
 var $newElems = $( newElms ).css({ opacity: 0 });
 // ensure that images load before adding to masonry layout
 $newElems.imagesLoaded(function(){
 $newElems.animate({ opacity: 1 });
 // update bricks width
 updateBrickWidth ($newElems);
 $container.masonry( 'appended', $newElems, true ); 
 // trigger scroll again
 $(window).trigger('scroll');
 //add_popup();
 //Reload new item
 reload_jPlayer();
 fancyBox();
 reload_gallery();
 });
 });

with 

 // $('#content').infinitescroll({
 // loading: {
 // finished: undefined,
 // finishedMsg: "<em>Oops, no more pages to load.</em>",
 // msgText: "<em>Loading more items</em>",
 // speed: 'fast',
 // img: 'http://i.imgur.com/QrOjF.gif'
 // },
 // navSelector : "div.navigation", 
 // nextSelector : "div.navigation a:first", 
 // itemSelector : "#content div.item"
 // },function( newElms) {
 // var $newElems = $( newElms ).css({ opacity: 0 });
 // // ensure that images load before adding to masonry layout
 // $newElems.imagesLoaded(function(){
 // $newElems.animate({ opacity: 1 });
 // // update bricks width
 // updateBrickWidth ($newElems);
 // $container.masonry( 'appended', $newElems, true ); 
 // // trigger scroll again
 // $(window).trigger('scroll');
 // //add_popup();
 // //Reload new item
 // reload_jPlayer();
 // fancyBox();
 // reload_gallery();
 // });
 // });

Hope this helps !  

Hi Koh,
To resolve this issue follow instruction in this guide
http://designwall.com/guide/dw-wall/#gallery_post