Problems with meters

Does anyone know this problem? Why I have a measure of 2/4 while I want a measure of 3/4?
Thank you in advance.

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Was there an existing time signature in the next bar (just to the right of where your screenshot cuts off) when you input the 3/4 time signature? Try re-inputting the 3/4 but with Insert mode active (if Insert mode is not active, Dorico doesn’t add extra beats)