Equation: Fe+CuCl2>FeCl2+Cu

Question

We put two iron nails into the copper chloride solution:1. mass of empty dry beaker:103.64 2. mass of two iron nails, before reaction:1.20 3. mass of two iron nails after reaction: 1.01 4. mass of beaker and copper (dry):104.4
Through calculations:number of moles of atoms iron reacted is 0.0034 mol Fe
number of moles of atoms of copper produced is 0.012mol Cu.

The ratio of moles of copper produced to moles of iron reacted should be 1:1,but I get 60:17 in lab,can you tell me What might have caused them to be differ from what we expect them to be?