Are you creating the walls in the 3D window? The origin/working plane may need to be moved. If in 2D, what are your settings for the base reference level / offset and/or home story? Screenshot of your wall settings dialog?
One of the forum moderators AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB
Check that the Gravity button is turned off.
Or maybe you have a height value in the 'Z' coordinate box (although this would not be random as everything would end up -50').
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Barry.
One of the forum moderators. Versions 6.5 to 27 i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10 Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11