What this group isThese are different products, not one product listed several times. The shop’s own label and the A-brand are never merged: they have different makers, and treating them as the same thing would erase the only comparison worth making.
Own brand is detected from the product name carrying the chain’s own label. Chains whose own brands use separate names are undercounted, so “branded” means “not detected as own brand”, not “made by the brand owner”.
Prices in this group were recorded between an unknown date and an unknown date. Most chains in this feed have stopped publishing, each on its own date, so rows here can be years apart. Per-chain freshness.