Different book price in security performance

If I book this transaction at the price of 21.30:

“Oct 8, 2023 Buy VanEck Defense UCITS ETF 1,000 21.30 21,305.00 21,305.00 CT2 Conto riferimento 2”

I get in Security performance a charge price of 28.71 which is wrong:

1,000 VanEck Defense UCITS ETF 47.525 0.23% 0.11 47,525.00 28.71 28.71 28,710.00 0.00 65.53% 65.53% 18,815.00

Can anyone explain this?
Thanks

Let me guess, your reporting period is 1 year.

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Yes, almost. Is it relevant?

Change the reporting period to 2 years, or any value before the purchase date. Then you will see the values you want to see. Why this is the case is actually self-explanatory and has already been explained many times in the forum.