Display level is relative to the input level, with 6 dB headroom. So if the input level is really low it will look like this.
Sure. That's not the bug though. The bug is that ONLY SOME of those scopes are lower than the others. Look at the MIDDLE scope in the screenshot I posted, for showing the umbrella. It's not the same scale as the other scopes.
Btw, that input is -24 LKFS, and was a loudness warred track.
Not an abnormal input level, and unfortunately not abnormal source. But yeah, not what I'm reporting.
(Pfew. Running a release build is taking more than 24 hours now, using 4 4.0 GHz cores on an i7-6700K with SSD drive and 32 GB of memory).
+ figuring out why your compiler isn't multi-threading properly. It should be ~maxing all of your cores, unless you *need* an compiler/linker optimization that isn't compatible with multi-threaded compilation.