slow transfer speed 10GB

I have 2 nas devices, one synology and the other is a qnap, both have 10GB nic's. They are both connected to gs110mx switch. From my pc to nas is get 110/MB on both nas devices but if i transfer from one nas to other i get 60/MB/s. Both nas devices are 8 drive raid-6 with ssd cache on both,ts-873(32gb ram) with qm2-2p10g1t 10gb nic and DS1821+(36GB ram) with E10G18-T1 10GB nic