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I believe that I am having the same issue as you reported, but slightly different scenario. We only have one sub-summary part; if I my web browser is not scrolled to the top, anytime I click on a record it will reset the scroll position to the top. This includes clicking in null-space on a record row. This only happens in WD; there aren't any triggers firing. I'm on OS X 10.9.5, Safari 9.1. I have also tried this in Chrome 50 and get the same problem.
But, oddly, other co workers in the same file don't have this issue. They also are using Safari 9.1, but on later versions of OS X (10.11). Our clients are sometimes stuck on older versions of the OS, though, so it would be nice to know what is going on and if there's a fix.