Agree, that looks like it fails to read how full your Ore Hold is.
I am looking into the script code to see where this value should come from.
https://github.com/Arcitectus/Sanderling/blob/master/src/Sanderling/Sanderling.Exe/sample/script/Mine.ore.cs#L383-L386
This looks like everything is derived from the inventory window.
To get closer to the solution, I would look at the raw values in the inventory window next.
If you upload a memory measurement from your setup, I take a look at this.
How to save a memory measurement is demonstrated here: