Your code onClickof Markeryou simply call {props.onToggleOpen}, which I hope to change the flag. Here you should send the marker that you click, so you need to change your onClickto something like below
onClick={() => { props.onToggleOpen("mark1"); }}
Mark1 , Marker. , Marker.
-, onToggleOpen, Marker, ( , `onClick). , , .
InfoWindow , Marker. , isOpen ( ), InfoWindow -
<Marker id = "mark1"
options={{icon: Mark1}}
position={{ lat: 34.4076645, lng: 108.742099 }}
onClick={() => { props.onToggleOpen("mark1"); }}
>
{props.isOpen["mark1"] && <InfoWindow id = "info1"
onCloseClick={() => { props.onToggleOpen("mark1"); }}
>
<div> content1 </div>
</InfoWindow>}
</Marker>
, .