Jquery UI can't drag from left to right side

Question

On my page I'm using the Jquery UI extension to sort divs. The divs are arranged in 2 columns. I created a JS Bin, please take a look on it.

When you drag all 3 divs to the left side, you can't get them on the right side again. Where is the mistake?

$(document).ready(function() {
  var $grid = $('.grid').packery({
    itemSelector: '.gridItem',
    gutter: '.gridGutter',
    percentPosition: true
  });

  var $items = $grid.find('.gridItem').draggable();
  $grid.packery('bindUIDraggableEvents', $items);
});

* {
  margin: 0px;
  padding: 0px;
  font-family: 'Francois One', sans-serif;
  font-size: 16px;
  text-decoration: none;
}
.grid {
  width: 1000px;
  background-color: aqua;
}
.gridItem {
  width: 49%;
  background-color: coral;
}
.gridGutter {
  width: 2%;
}
@media screen and (max-width: 1000px) {
  .grid {
    width: 100%;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.0/jquery-ui.js"></script>
<script src="https://unpkg.com/[email protected]/dist/packery.pkgd.min.js"></script>

<div class="grid">
  <div class="gridGutter"></div>
  <div class="gridItem">div 1</div>
  <div class="gridItem">div 2</div>
  <div class="gridItem">div 3</div>
</div>

Answer 1

The Packery documentation says the following:

Without columnWidth set, dragged items can only be dropped in place of other items.

You can set a selector for the columnWidth so it takes that element's width as the column's width.

$(document).ready(function() {
  var $grid = $('.grid').packery({
    itemSelector: '.gridItem',
    gutter: '.gridGutter',
    percentPosition: true,
    columnWidth: '.gridSizer'
  });

  var $items = $grid.find('.gridItem').draggable();
  $grid.packery('bindUIDraggableEvents', $items);
});

* {
  margin: 0px;
  padding: 0px;
  font-family: 'Francois One', sans-serif;
  font-size: 16px;
  text-decoration: none;
}
.grid {
  width: 1000px;
  background-color: aqua;
}
.gridSizer,
.gridItem {
  width: 49%;
}
.gridItem {
  background-color: coral;
}
.gridGutter {
  width: 2%;
}
@media screen and (max-width: 1000px) {
  .grid {
    width: 100%;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.0/jquery-ui.js"></script>
<script src="https://unpkg.com/[email protected]/dist/packery.pkgd.min.js"></script>

<div class="grid">
  <div class="gridSizer"></div>
  <div class="gridGutter"></div>
  <div class="gridItem">div 1</div>
  <div class="gridItem">div 2</div>
  <div class="gridItem">div 3</div>
</div>