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I also contacted Google and here is what they said:
"the Campaign Summary page shows statistics in ascending order of cost. This is a known technical issue and our engineers are currently working to solve the problem and hope to reach a resolution shortly. Thank you for your patience."
but, this time, it's not happening to me. good luck in getting it the attention it deserves.
The last time, this problem persisted for 5-6 weeks, before being fixed.
I think it probably means, that this part of the code, is badly structured, and very difficult to maintain. Maybe, they need to rewrite and clean it up.
I think I tried changing the column sort on the campaign summary page before and back and it did not help but I don't think I clicked on a campaign and then clicked on a link to the campaign summary page so maybe doing so resets it somehow. Sounds to simple but give it a try if you have not already as it can't hurt.
If it is still sorting by the new column you changed to, that probably means it remembered your change so then try to click on your prefered column and repeat the process to see if it continues to remember it.