Maybe Tredz (like lots of others) take an XML feed from suppliers’ stock lists and drop ship direct to consumer for certain distributors’ lines?
It’s something plenty do in order to try and compete online even if they don’t have the space/cashflow/business model to hold loads of stock, but it does pit a retailer at the mercy of a third party’s data.
Doubt it’s anything malicious, but if you ever have a doubt, it’s always worth a call to check.
In time I reckon the split online/physical retail thing will sort itself out, but I reckon EPOS integration is needed before that happens.