Miscalculation in Trade Republic?

I'm trying to understand how Trade Republic calculates the total return of my portfolio, and it doesn't match the manual sum.

If I add up all the individual positions (the green and red numbers "since purchase"), I get approximately +€450, but the app shows +€711 as the total result.

I'm not duplicating positions, and I'm not missing any data (I already checked), but there's still a significant difference.

Does anyone know why this is happening?

Does Trade Republic use a different calculation (average price, currency, rounding, etc.) other than simply adding up the individual P/L values?

Thanks 🙏