Gentlemen Can you clear folloving effect - Author tested two real time platforms in one time Strategy Runner from Global Future and Openecry from Openecry . Quote equal but for eahc bid or ask order different volume by different platforms. Illustrative example ERTU5 Openecry Strategy runner bid 7 585.10 bid 15 585.10 Can be different only best bid/ask volume and can be different all orders volume . Some time volume in both platform are equal . For tactic buy bid sell ask that can be decisive . Where can be ground ?