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You need to be careful when sourcing any timber products from a reclamation yard. If they have had any paint or varnish on them then the yard will dip them, basically put them in a large tub of liquid nitro-mors and leave them until the paint lifts off (I don't know the exact process this is my best guess). As a result of the dipping process the timber often takes on a lot of moisture so will shrink back once it dries out.
Google suggests it was here:
https://www.reclaimed.uk.com/