Each of these walls used to be indiviudal rather than one toatl piece, I spammed ctrl z but it didnt help. How do i fix this?
Hard to tell from a screenshot, you should share your.skp model so someone can investigate…
The screenshot indicates that smoothing has been applied to a rectangular shape.
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Agreed, but the “streaks” could also mean that something is out of alignment I think…
As others have said, your vertical edges have been softened; the dark diagonalish streaks indicate the edges have been smoothed too. Turn on View/Hidden Geometry, select the vertical edges and uncheck the Soft and Smooth boxes in Entity Info.