Dataflows modifying EVERYTHING instead of rows that changed

I have a power automate flow that triggers based on changed values in a table. The table has a dataflow that somehow triggers every single row with the flow even if most of the rows are identical to before the refresh. I think the act of the dataflow itself is "modifying" every row, therefore triggering the flow for every single row. How do I stop this? How do I make it so the dataflow only updates the row if there is a different value there than before? I've tried incremental refresh but we don't have a date column to help with that.