Market buy order filled partialy

[degger80]

Buying 926 tokens by market order. In response logs I see also 926. But on Mexc site I see that executed only for 894 and have status filled.
Is there parameter that forces it to fill market buy completely requested volume?

const mexcREST = new Mexc.Spot(api, secret)
let res = await mexcREST.newOrder(symbol, 'BUY', 'MARKET', {
  quantity: value
})
console.log(res)