Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: Intel(R) UHD Graphics 600 Intel 4.5.0 - Build 188.8.131.5237
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-11 13:50, hash: rB06312c6d2db8
In 2.80 the positions of video and audio where swapped, so video would be on top and audio below, however when dragging and dropping a strip the first strip is inserted with video on top and audio below, but the following dragged and dropped strips, the video and audio will be swapped as shown in this gif:
The bug is that there is not consistency in what order the video and the audio is added.