I strongly urge to you continue working with product support because it sounds like the problem could still be in a variety of places (the module/wiring, the controller, your logic). Before you can make it go away for good you'd need to narrow that down. You don't have an extra SNAP-PAC-R1 you could swap with this one? And/or an extra SNAP-ODC-32-SRC? Does the problem happen frequently enough that you'd be sure if/when it's gone?
Anyway, to answer your question, when you test this module with PAC Manager (via the mem map), you are accessing that XVAL (external) vs. IVAL (internal/software). Ditto when you read the mem map value via your strategy. I'd recommend you stop/clear the strategy if you can to make sure your strategy isn't referencing that point somewhere you didn't realize, then test it w/PAC Manager. But as I mentioned earlier, check with support in the case there's something wrong with the -R1 or the module.