In all jDownloads releases before version 3.2.4 and 2.5.6, is missed a closing 'div' tag in the default category layout.
User which have installed directly a newer release must do nothing.
But when you have an earlier version have installed do this to fix it in your installation:
- go to the jDownloads manager in your backend
- click on the category icon
- click on the default layout title in the list to open it
- search this lines:
{sub_categories}
<div style="clear:both"> - change the second line to:
{sub_categories}
<div style="clear:both"> </div> - click on the save button/icon
Note: the ' ' character should be added in case that perhaps is later use the option: 'Remove empty HTML tags' in the configuration.