Seems like you fetch only 1st page for doppler knives on CSFloat without phase parameter. It show different phases for dopplers (& gamma) like 1st, 3rd and 4th. but something more rare and expensive like phase 2 gamma, phase 4 doppler and gems do not appear on first 40 listings usually.
For example: “★ Butterfly Knife | Gamma Doppler (Factory New) - Phase 2” shows only 2 listings on CSFloat, which is of course not true. Same issue with Emerald, Butterfly Knife Doppler Phase 4 fn AND i suggest ALL DOPPLER & GAMMA doppler phases for CSFloat. Please use more requests with filter (&paint_index=) for phase and stattrak/non-stattrak toggle (&category=) to cover all phases.