chain fail & cant return to sub process model Ui page

Hi all, 

when i want to save data in UI and then page jump out。

but i check the whole pm, chain every node and no error and the whole workflow in pm is fine .but just jump out .

Below is my design.(just a mock)

after i click save button in  UI and run the yellow part ,then the page will jump out.

BUt if click save but dont run yellow part ,the page will keep.

the yellow part is a sub process model to save data into db.

all sub process model node chain.

any idea for this? looks like yellow part is root cause.