its a default setting maybe a glitch by the looks of it, its set to -2 in the database. seems to display as you say --126000.
would guess that when Orion shows you the 'chart' data version is translates any value <0 as 'unknown' but in excel it should export it as null/blank value .
sounds like a small bug.
Thank you very much!
I will ignore "-126000"!