More information about the flow would be helpful here.
Below is one of the cases where I have observed repeated triggers of a flow:
If you are using a connector let's say SharePoint creates/modifies the item and has any action in your flow that is updating the same item then in this case the flow might re-trigger as item modified. You can maintain a check in terms of any status field (or any to restrict the item modification trigger) in the If/else condition to minimize this.
