Staff collisions

Why do I keep getting staff collisions? I thought Dorico prevents these by default. How can I stop them from happening autotmatically. If a system has to be moved to the next page then so be it.
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Happens all the time to me. Usually if I reset the template it corrects itself - but not always. Of course if I set the staff size too high for the number of instruments it will happen regardless.

Windows 10 Pro 64
Dorico 3.5

Here’s an explanation of the problem:

The easiest fix, honestly, is to reduce your staff size to Size 5, which would be better for a score layout. Of course that wasn’t the point of your question, I know.