WP adding ‘-2’ to the ID name in my Sidebar

Hoping someone can help me with this…

For some reason WP is adding ‘-2’ to my some of my sidebar ID’s. Here is one example…It should read:

‘<li id=”search” class=”widget widget_search”>’

Somewhere along the way it changed to:

‘<li id=”search-2″ class=”widget widget_search”>’

I’m not exactly sure why it is doing this as I haven’t touched anything in the sidebar code. If anyone has any ideas or solutions to stop this from happening I would really appreciate it.

Thanks in advance!