Check your reputation with the engineer. IF you unlocked the engineer but only ranked their reputation up to 3 than any engineering done at space stations' workshop is limited to rank 3. This is why it's important to max rank the reputation because it decides how high you can remote engineer modules with pinned blueprints.WHY i can not G5 my power plant?
You need to engineer each module from grade 1 up to grade 5. You can't just jump to engineering Grade 5this is to see that the problem with hera tani is the same with dweler as well