Campaign bug: Purchased Water Engine patent can be patented by other players, also negates your patent (Resolved: no bug)

I bought the Water Engine patent as a permanent upgrade in the campaign. When I started the next game it worked, but then towards the end another player patented the Water Engine in their patent lab. This then meant that they (presumably) had it, but my freighters and offworld market started using fuel again. I believe the freighters individually switched over as soon as they landed.

 

 

The images don't seem to be showing up for me, so here are the raw links:

 

Double patent: http://imgur.com/Evz4QFe

Freighter using fuel: http://imgur.com/2MdoQXC