The workflow cannot run properly once I add a process start form

I am new to Appian and I am evaluating this platform recently. 

I defined a workflow without "process start form" it worked as expected and data finally has been save into db; This is my workflow and it is as simple as enough:

And then I tried to add a "process start form" (I didn't want it but seems a "start form" is required if you want to start a process from the site pages), in my "process start form", there is nothing but a "Notice" text block and a "Submit" button(submit = true). but it behaved oddly since then. It showed that it only has "Start Node" and "End Node" now when I debugged it.  From the debug monitoring tab it seems totally not my workflow.

Please can anyone tell me what's wrong?

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