I have a strange problem with (normal) currencies (with crypto assets all works fine), I always get the same result of -600 of each phantom trade:

{GBPUSD_B1::l6801} Long 1@1.40057 at 20:08:34
{GBPUSD_B2::s6802} Short 1@1.40113 at 20:08:34
{GBPUSD_B1::l6801} Sell 1@1.40070: -600 at 20:08:40
{GBPUSD_B2::s6802} Cover 1@1.40065: -600 at 20:08:40

[1268: Mon 18-02-05 20:09:02] (1.40118)
{GBPUSD_B1::s6901} Short 1@1.40179 at 20:09:10
{GBPUSD_B2::l6902} Long 1@1.40119 at 20:09:10
{GBPUSD_B1::s6901} Cover 1@1.40176: -600 at 20:09:17
{GBPUSD_B2::l6902} Sell 1@1.40187: -600 at 20:09:17

[1269: Mon 18-02-05 20:10:03] (1.40141)
{GBPUSD_B1::s7001} Short 1@1.40187 at 20:10:12
{GBPUSD_B2::l7002} Long 1@1.40131 at 20:10:12
{GBPUSD_B1::s7001} Cover 1@1.40181: -600 at 20:10:14
{GBPUSD_B2::l7002} Sell 1@1.40222: -599 at 20:10:14

In the asset list GBPUSD_X looks identical to the other assets:

GBPUSD_B1,1.41249,0.00047,-0.4898,0.3292,0.00010,0.080288,2.8336,400.218,1000.0,0.600,B1_Arb:GBP/USD
GBPUSD_B2,1.54901,0.00006,0.07,-0.15,0.0001,0.09129,16,0,1000,0.6,B2_Arb:GBP/USD

Any idea where I can search for the reason?