Try this after your next month end. Take the leads each platform claims it produced for you, and add them up.
Now compare that to the number of transactions that actually closed.
The total will be larger. Often comically larger. Six platforms, six report cards, six straight A's, all of them describing a month your closing table says never happened.
Nobody is lying, exactly. Every number is calculated precisely as documented. The report as a whole is still untrue, because it answers a question you did not ask.
Why it breaks, and stays broken
Each platform can only see the part of the world it touched. So each one counts the buyer it touched, and every other platform that also touched that buyer counts them as well.
One person sees your listing on a portal, watches a video on social, searches your name three days later, clicks a retargeting advert, then rings you from the sign in the garden. That is one showing. It will be counted by four systems and it was produced by the sign.
None of them are wrong about what they saw. All of them are wrong about what caused it.
The specific fictions
The view-through. Somebody had your advert on screen, did not touch it, and later did something you wanted. That is counted as work your advert did. Sometimes it was. Frequently it was a coincidence with a budget attached.
The branded search. A campaign that captures people typing your own name is reported as demand it created. It captured demand somebody else created, quite possibly the yard sign, and charged you for the privilege.
The last click. Whatever happened closest to the enquiry takes the whole credit. In this business that is almost always the least persuasive thing in the chain, because by then they had already decided.
The lead that is not a lead. A form fill counts the same whether it becomes a signed agreement or a wrong number. If your reporting stops at the form, you are measuring the volume of a thing you have not established you want.
The reckoning
At my last job I kept a private list of every promise the chief executive made in a meeting, and once a quarter I showed him the ones he had not kept. He called it the reckoning. He also never once missed a quarter of it.
Do that with your platforms. One page, once a quarter. Down the left, what each one claimed. Down the right, what actually closed and where those people say they found you.
You will not resolve the gap and that is not the point. The point is that everybody stops treating six overlapping claims as six independent facts, and the conversation moves from which platform performed to what you actually spent per closing.
What honest looks like
Pick one number that is real and hold every channel to it. Cost per closed transaction. It is the only figure in your business that cannot be double counted, because a house closes once.
Then ask every new client, out loud, in your own words, how they found you. Write it down. It is unscientific, it is biased, and it is still more useful than six dashboards, because it is the only measurement in the entire stack that nobody is grading themselves on.
And turn something off occasionally. On purpose. If nothing changes, you have learned something no dashboard was ever going to volunteer.
Any road up
Your reporting is not lying to you. It is doing exactly what it was built to do, which is describe each platform's own contribution in the most flattering arithmetic available.
You are the only one in a position to add it up and notice it does not reconcile. Nobody else in the chain is paid to.