Put large medkit in research table.
It said 75 scrap, so I put in 75 scrap.
Started, the 10s count went, and when it finished nothing happened.
Tried again, same thing.
Took everything out, left table, tried again, same thing.
Checked WB and it was 83 (75+tax).
Put in table with stack of scrap.
It worked and took 125 scrap from the stack.
Server: Pure