The mismatch occurs because the write data from the AXI bus interface is going into the Intel® Stratix® 10 MX HBM2 IP's soft adapter and through the Universal Interface Block Subsystem before it reaches the Intel Stratix 10 MX HBM2 memory model. The "write data" bus value that is reported at the HBM2 memory model has been modified due to the data bus inversion (DBI).
Device Family: Intel® Stratix® 10
Intel Software: Quartus Prime Pro
Last Modified: Fri Feb 01 2019 00:06:03 GMT-0800
Version Found: v18.1
Bug ID: 1506982144
IP: Stratix 10 External Memory Interfaces