refresh page when field is changed

refresh page when field is changed

hello all,
how can i do re-fresh page when a field input is changed?

i have if statement, so when user selected an input (ex: to destination field) the corresponding other field changed, but when user changed again the original input (ex: destination field), the corresponding field does not changed properly. I have to hit refresh  so that template goes back to default options

thank you
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