Hiding a single (or multiple) item in an ordered list with any delay changes the list item's index to 1. Without a time delay, this does not occur.

Here is a simple test case that hides the second item. If you hide it slowly, when you reshow it, item 2 shows as #1.

<ol>

<li>this is an item 1 to display</li>

<li id="num2">this is an item 2 to display</li>

<li>this is an item 3 to display</li>

</ol>

<input type="button" onClick='$("#num2").hide();' value=' Hide number 2 '/>

<input type="button" onClick='$("#num2").show();' value=' Show number 2 '/>

<input type="button" onClick='$("#num2").hide(500);' value=' Hide number 2 slowly'/>

<input type="button" onClick='$("#num2").show(500);'

value=' Show number 2 slowly'/>