Unable to hold position using Ardusimple simpleRTK3B Pro + Here3 Compass in Loiter mode

I’m using Ardusimple simpleRTK3B Pro for navigation + PPK purposes. The issue is that the drone is unable to hold it’s position in loiter mode. One thing i noticed is, when i switch from simpleRTK3B to Here3 GPS receiver, the drone is able to perfectly hold its position. Any pointers on how to solve this? I’m attaching the log files for reference (.bin and tlog) Ardusimple_Flight_Logs - Google Drive

Regards,
Jayesh