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Maybe I'm missing it (as I'm not familiar with that software), but what layer height are you using?
As the OP pointed out, it kinda looks like it's skipping layers. I would say to try re-exporting the code...but it's happening on a lot of models it looks like.
Try using a G-Code viewer to ensure that it is actually making code for each layer.

As for the question about "upside down". if the STL is upside down, some of the overhangs won't print well. When they don't print well, the layers don't stick and cause an issue similar to yours. But yours is happening on vertical walls (no overhang), so that doesn't appear to be the issue.