This is likely because of the class property being enabled on the "Table row" element. It seems like your table has different classes for odd and even rows. And with that in mind, it might not always work correctly, or that the row your targeting might have that Id, but its class may be different.
I suggest disabling the class property and trying again. You might want to enable the Ordinal property instead and make it equal 0, which should target the 1st row.
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