One can only assume that Navigraph overwrites the NavBlu data. You would need to download the latest AirAC data from NavBlu to get their data back into the sim. I have never looked. Is there anything in the marketplace? Otherwise I guess you would have to try removing the folder and restart the sim to see if it forces a reload. The alternative would be to wait for the next cycle to get the data.
Only guessing here…
I put in Navigraph and will never look back.