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ender-6 with bltouch - intermittently adds -5mm offset and ruins my nozzle and scoring bed

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Ender-6

Firmware 1.0.4.9

Roughly every 3rd or 4th time I use the bltouch it seems to get offset by -5mm in the offset table.  Other times it seems to work fine.  When it screws up, if I add 5mm, the offsets align with what I typically get.  When the table is off, it carves a nice score into my surface and grinds my nozzle down.  This seems like a numerical bug in the firmware, not a simple mechanical issue.

The table at the bottom ("Add 5mm") very closely matches what I typically get from a good bed leveling.  The "Screwed up Table" is what it is recording when it ruins my nozzle.

Any idea what is happening?

Screwed up Table        
  0 1 2 3 4
0 -4.815 -4.924 -5.07 -5.185 -5.272
1 -4.981 -5.048 -5.172 -5.252 -5.328
2 -5.165 -5.213 -5.308 -5.356 -5.405
3 -5.318 -5.349 -5.432 -5.457 -5.495
4 -5.449 -5.484 -5.556 -5.573 -5.582
           
Add 5mm        
  0 1 2 3 4
0 0.185 0.076 -0.07 -0.185 -0.272
1 0.019 -0.048 -0.172 -0.252 -0.328
2 -0.165 -0.213 -0.308 -0.356 -0.405
3 -0.318 -0.349 -0.432 -0.457 -0.495
4 -0.449 -0.484 -0.556 -0.573 -0.582