I am investing in Bondora with 'Go and Grow' strat...

I am investing in Bondora with 'Go and Grow' strategy for a few months. What I recently noticed is that the expected interest rate of 6.75% is NOT what you get. In the begging it was about 6% (daily income * 100 / sum invested * 365). For the last week it is 4%. They claim that the average return is even higher than this expected level, but currently this is not the case. Lets see the coming weeks...