This is normal behavior for this trigger. If PA detects multiple actions on a single item within a short period, it will merge the changes and execute once.
Edit: @MeganSP
Another way you can possibly avoid this behavior is to create a manual trigger button on your list.
1. Create an instant flow with a "For a selected item" sharepoint trigger.

3. Create a text column and leave it blank.

4. Open the column formatting settings

5. Switch to Advanced Mode

6. Enter the following JSON formatting to create a trigger button. (Change FLOW ID HERE to the ID of your flow)

{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "div",
"children": [
{
"elmType": "button",
"txtContent": "Trigger Flow",
"customRowAction": {
"action": "executeFlow",
"actionParams": "{\"id\":\"FLOW ID HERE\", \"headerText\":\"Trigger Flow\",\"runFlowButtonText\":\"Trigger Flow\"}"
}
}
]
}
Finally, you have buttons. When you make changes, you can run the flow on demand for that particular item.

Hope this helps!