Joomla 1.6.x and 1.7.x have a bug that can mixup your articles when editing them. A quote or </p> tag is added after the plugin code.
This is a problem for the Google Maps Plugin and Include component plugin.

I've suggested a solution to solve this problem and I hope that it will be included in the next Joomla version.

See the following links where this problem is decribed:

• https://groups.google.com/d/topic/joomla-dev-cms/JZVQu_FtaLk/discussion
• http://forum.joomla.org/viewtopic.php?f=579&t=614937
• http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=25729

Please leave a remark here to give it a higher priority.

You have the following alternatives to solve:

• You can add a space after the last quote in the mosmap command so: {mosmap address='your address' }
• You can downgrade Joomla to 1.6.1.
  I don't know if it exists in Joomla 1.6.2 because this one was skipped very fast by Joomla.
• You can edit the article and toggle the editor to none editor.
• Contact me and ask me for the change Joomla file so you can hack Joomla to solve it.

I hope this will be solved soon.