Rich hand
I've never heard of Spitfire advanced, but I've only been around for 62 years and only trialled products from the UK and USA.
Maybe you've been lucky, or maybe you're colour blind, but, unless you just started last week, or keep well away from furniture, when both, prespraying / cleaning, or don't move furniture, or maybe even lift the carpets, take them away and bring them back, dry.
It is totally impossible to avoid dye transferring from some dark stained wood to carpets
....even the slightest intrusion by chemical free water will cause some dyes to run.
Unless, of course, they have glides , or similar, placed underneath, before starting, but that is not what you're suggesting.
Not sure about your ambiguous remark, being ambiguous
robbie