BQ34Z100EVM SOC

Hello

I am using the bq34z100evm and the bq Evaluation Software. When I started the Gas Gauge, the Max Load Time to starts with 56min and 100% SOC. After a while the Gauge shows 80% for example and 40min. That's ok, but few minutes later the Gauge shows 96% an 54min. Why is this happening? I used the Load Mode=1 and Load Mode=0 and have the same problem.

I hope someone could help me