Huge envelope jump

While I was editing an fx wet/dry envelope just now somehow the value jumped to about 9900%, and I got a huge noise burst when I played it back. I don't remember what exactly I did to make it happen. I've included a project file. Vista 32, 3.66

Any idea at all what action caused this to happen? Were you editing the envelope with the mouse?

Yes, I was editing with the mouse, and I had used "reduce number of points" right before. That's about all I can remember.

Sorry, I posted the incorrect version. I was on 3.66 when it occurred.