Hi, not my plugin but had the same issue. Fixed it by adding this entry to the CompundOptions.json under /Data folder:
Add it under the section Building

{
"_comment": "Sell Computer station for Scrap x 300",
"sellId": -1588628467,
"sellAmount": 300,
"sellAsBP": false,
"currencyId": -932201673,
"currencyAmount": 1,
"currencyAsBP": false
},

I've try to add in to CompoundOptions.json file with unloading and loading plugin but it's same:
{
  "_comment": "Computer Station x 1 for Scrap x 550",
  "sellId": -1588628467,
  "sellAmount": 550,
  "sellAsBP": false,
  "currencyId": -932201673,
  "currencyAmount": 1,
  "currencyAsBP": false
},​