75% of my inventory just disappeared!

Sorry I’m certainly no expert on using Manager, but I seem to be able to stumble through most if it… however I just noticed my inventory has gone from 1.2million to just over 200,000 and I have no idea what happened to it.
To be clear, I still have the actual inventory here on hand…it’s just disappeared from this manager software…
…does anyone have any idea of how this might have happened??

Click on the figure 200,000 and track down individual transactions which made up the figure. Are any transactions missing?