After collecting from the excavation site in Planet swoof , I was left with two swoofs. All 81 swoofs disappeared. I restarted the game but still my swoofs are nowhere to be found. So, I restarted my android tablet and viola they’re back.

This happened when I opened my Smurfs’ Village in my new android tablet.

There you go! Just restart your tablet or phone. Hopefully this works for you.

Have a sparkling day!