Signature PP not changing after breakthrough today

I know my Signature PP is to low, so in todays workout, I did a 5s sprint with a PP of 754 W. Todays workout says I had a breakthrough, but my signature still shows a PP of 665 W. Why is that? Or do I have click on Recalculate Regression?

Since the effort was so short, Xert says it’s a breakthrough but doesn’t adjust your numbers upwards. Next time, hold it a bit longer just to be on the safe side. You can use the Advanced tab on your Actiivty Details for the activity to override the PP value and save/lock.