Some elements not showing up when printing drawings

We have encountered an issue in which solid objects are printing wireframe/disappearing regardless of the view style settings within the Microstation file (which is set to hidden line). The picture on the left shows a detail within Microstation itself and the one on the right shows the detail in the PDF once printed.

This effect is inconsistent and only occurs in some referenced views; others display without issue.

In another example, an elevation is set to hidden line (as shown on the left), but when printed, part of the elevation is missing and the areas around it are shown as wireframe. This is very strange as the rest of the elevation is showing with the correct view style.

Does anybody have an idea why this would be happening?