Can you give explanation how the last 12 months XIRR is calculated? Last month I had over 91% and this month the value is over 161% at this moment. Seems ridicously high to me…

There is small question mark next to rate of return that explains the calculation. Your last new investment was in march and all later investments have been refinancing of old loans, because of that it is skewed too high and not correct. For calculating your total profit use formula “Interest incl.” - “Bonus” - “Principal loss”.