Inconsistent paragraph spacing in a text frame

This text frame in a Page Template
template
results in this frame in the part
result
Where did that extra vertical spacing come from?
There is nothing in the paragraph style to account for it.
Dorico 6.0.22.6052

If there’s nothing in the spacing of the paragraph style, is it possible that the text entered in Project Info has an (invisible) carriage return after the title or before the subtitle? This might have happened if you copied and pasted from some other source. You can try selecting everything in the text box and retyping it.

Thank, yes, obvious. I should have known.