Shield Booster Slot Not Appearing for Engineering

I’ve been engineering my boosters for my corvette but I just realized that one of them isn’t appearing on the remote engineering list. I have 7 total fitted with a heat sink occupying the 8th slot. But when I pull up remote engineering I only see 6 options for my shield boosters. I’ve even tried switching that particular booster to a different slot and it still doesn’t show up. Anyone run across this?
 
Is it grandfathered? Grandfathered engineering can only be converted at the engineer’s base. Can’t be converted remotely.
 
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