Direct select paging buttons - directional confusion

Just a quick one ...

If I've got a direct select module open 'normally' (for want of a better expression!), the down arrow pages through the bank of direct selects in the expected order (page 1 > page 2 > etc.), and the up arrow pages back towards page 1.

However, if I open direct selects in a tab, the arrow keys work the opposite way round - up arrow pages forwards through successive pages, down arrow pages back towards 1.

Is this an intentional inconsistency? Can't imagine why it would be ...

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