If a node in Umbraco ever becomes corrupted there are a few ways to fix this issue.

Try the following steps in this order:

1. Try to republish the node.

2. Delete the node and manually clear the recycle bin.

3. If the problem persists, open up ~/App_Data/umbraco.sdf (use the SQl Compact Database Toolkit for Visual Studio) and manually delete all artefacts pertaining the corrupted node.

4. Republish the entire site by visiting this link, right click on CONTENT and then choose Republish entire site, which will rebuild ~/App_Data/umbraco.config.

This should solve your problems, or at least it worked for me!

Good luck, and thanks goes to @camaya at https://umbracians.slack.com/!