Due to a problem with the Intel® Quartus® II and Prime software versions 15.0, 16.0, 16.1, 17.0 and 17.1 you may see incorrect read data when the PCI* Express link is highly utilized and there are a lot of out-of-order completions. This problem only occurs for PCI* Express Hard IP Avalon®-Memory Mapped 128 bit variants.
When this happens, parts of data from incoming reads may appear in the middle of data from a previous read.