Weird service portal instance

Today I was working on a widget Accept / Reject Solution. I found a share (link defunct) that looked like it would meet my needs. It looked great, until I tried rejecting a custom extended task table.

I couldn't set it to work so I backed it out and determined I'd roll my own, that share updated a existing sp_instance. After I backed out the update set that sp_instance record was still there. I couldn't get it to fall off the page regardless what I tried;

I ended up making a new column, moving all widgets over, then deleted the old column.