2 parallel break's: the gap size of 1 of them is not correct

Hello,

Can somebody help me with this problem:

I have a section view and in that section view I have 1 vertical break and 2 horizontal break's. The problem is that I want a gap size of 10 mm but 1 of the 2 gap sizes is not correct(see picture).

thanks in advance,

Michiel

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