Four things tell you the two narratives have drifted.
You describe the company differently depending on the room, and not on purpose. Adjusting emphasis is fine. Not being able to say what the company does the same way twice is not.
Your team gives different answers. Ask three people what the company does. If you get three answers, there is no thread. There are three improvisations.
Investors ask what you actually sell. That question means your deck described a market and never landed on a product someone buys.
Customers ask if you are a real company. That usually means your public presence reads like a fundraise instead of a business. Too much vision, not enough proof that you deliver something today.
Any one of those is a signal. Two or more means the thread work has not been done, and no amount of rewriting either document separately will fix it, because the problem is upstream of both.
Where to start
Write the thread first. One page: who you serve, what changes for them, what proof you have, and where this goes. Then build the deck from it and the website from it, separately, and check each one against the thread rather than against each other.
If you cannot write the thread, the problem is not narrative. It is that the offer underneath has not been decided, and that is what the Growth Navigator builds with you: offer statement, buyer profile, messaging, and the narrative that runs through all of it. Seven days free with full access.
If you would rather start by finding out what stage your business is actually in, the Market Ready Scorecard takes about five minutes and costs nothing.