Architect Archive

I'm a little worried that my crafting stations aren't what they should be...

My original crafting stations had efficiency ratings of around -1 to -3.

When I experimented with them, then went to about -9 (with good successes).

Now I have added all the options (but no experimentation) and they are now down to about -32 to -40.

Are these negative numbers correct? From the other posting I have read here, all the numbers seem to be positive and I am worried that my stations (or me), may be bugged.

Any thoughts?