Alignment of tuplet braces

I have 3/4 spaces set by default for the minimum vertical distance inside tuplets in Engraving Options, but that isn’t the issue here. Same tuplets and notes and yet the last tuplet in the lowest staff (highlighted) is much closer to the stems and not aligned with the previous tuplets. Any reason for why that is preferred? I know I can move the tuplet higher in Engraving Mode but was curious why Dorico prefers this placement. Thanks!