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Getting crazy cam_mul values

For most of the cameras I've tried, I either get values like 0.6 or 600 (which I divide by 1000).
However, I have a DNG where I get: INFO: cam_mul 0.001000 1127039.874999 0.004999 0

Raw Therapee seems to load the file just fine though. And so does IrfanView.

Any ideas what's wrong, or what I should do?