Facts are not truth, and have nothing to do with truth.
A fact is nothing more than an assumed predicate. They are used to shorten conversations much like we might use a pronoun instead of a proper noun all the time.
The moment the predicate is disputed, the fact ceases to exist. It becomes an argument.
A fact does not have anything to do with the truth. It can apply equally well to fiction. In Lord of the Rings, for example, it is often considered a fact that Hobbits have hairy feet. it is, after all, so stated by the author.
A fact that the Earth is round is just an accepted predicate, nothing more. It saves us from having to try to show the Earth is round in everyday conversation.
A fact that the Earth is flat is also an accepted predicate, for those that do not believe the observations showing the Earth is round. Among them, the Earth is simply flat. Conversations between them can be conducted without having to bring up the dispute over and over.
Once a believer of the observations showing the Earth is round enters the group of those that believe the Earth is flat, BOTH facts are destroyed. They BOTH become an argument.
Remember, all observations are subject to the problems of phenomenology. No observation is a proof for that reason. They are evidence only. All data, which is the result from observations are subject to the same problems.
Phenomenology is that branch of philosophy concerned with defining what the word 'real' actually means.
Take a simple observation: the daily sunrise.
* to one, it is a God rising into the sky to light and warm His Domain.
* to another, it is a vehicle a God is riding in.
* to another, it is a ball of fire.
* to another, it is circling a stationary Earth.
* to another, it is stationary, and only appears to move because the Earth is spinning.
* to another, neither is stationary. The Earth and the Sun orbit each other, and both are orbiting around a galactic center, and the galaxy itself is moving at some unknown speed relative to something else.
Same observation, SIX different interpretations. All observations require interpretation of what is stimulating our senses, even if instruments are involved to enhance our senses. Those interpretations are made according the model of the Universe and how it works that each of us carry. That model is made up of our past experiences. It is as unique to each of us as a fingerprint.
So which is 'real'? What is 'truth'? It is simply which model you accept, which in turn is conditioned about which model of the Universe you accept already before the observation.
In other words, 'real' and 'truth' are quite literally what YOU choose to make it!
If some observation or some reasoning comes along that you can't fit into your personal model of the Universe, you have to be able to fit it in somehow. On that day, for you, the Universe literally changes. So does what is 'real', and so does the 'truth'.