Popular Pledges pipped on pledge page aren't indicated consistently

This one only appears when pipping a pledge that is also displayed in the Popular Pledges section of one's pledges page.

Steps to reproduce:

1. Navigate to your pledges page.
2. Find a Popular Pledge that also appears in the "Your Pledges" section. (Pledge a popular one if one isn't listed in both sections")
3. Pip the pledge by clicking the Pip link in the "Your Pledges" section.

Actual Results:

Observe that the pledge does not display the Pip in the "Your Pledges" section. Instead the pip is displayed in the Popular Pledges section.

Expected Results:

I expected the pip to be displayed on the pledge where I clicked it. I would also expect that the pip would appear in the "Popular Pledges" section.

Here's what it looks like after I pipped the "read more stories" pledge:


I had this problem while using Firefox 3.0.9. I would have tried IE 8 but I still can't log in with that browser.. I also tried it in Google Chrome but came up with a different problem. Which I will report separately.