Horizons How come I can only release two collecting limpets?

Hi guys, just thought id try my hand at mining. At first I could knock out as many collector limpets I wanted, but now since owning a Python im limited to two until they die. Why is this? I had a type 9 beforehand. Any help would be great
 
I put the limpet controllers in the Class 5 slots, 3 each (6 total) and a refinery in Class 4. Prospector in Class 3, the rest cargo (100 tons). Works well!
 
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