multiple /xas requests for 1 on leave event

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In my application I have a form which contains a listview which contains another listview depending on the entity of the parent listview. Every line of the inner listview contains some input fields and some calculated fields. These fields are all in the same entity. Every input field has an on leave event which calls a microflow which calculates the fields for the last five columns of the same line.   When I change 1 amount in 1 input field and leave the field I see that 36 /xas requests are triggered (see the network tab on the right side of the screenshot). I don't know where these come from. I would expect 1 on change event equals to 1 /xas call. Can someone explain this behaviour?  
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