It's because it's the old CST723 Promenade bowl, the one that was like the CST703 bowl that I never liked.
The new CST423 and CST424 are now like the Drake, no splash.
The Dartmouth CST754 is a good bowl too.
My daughter has a promenade and it splashes onto the seat sometimes . Is the same true for the dartmouth or is that because it an old promenade and they fixed it?
I've had a Dartmouth in regular use for over 2 years. No splash.