LE 4 Aggregate Input device issues

Hi - I have four Presonus Inspires chained to create 16 inputs – I only plan on using the xlr’s so 1,2,5,6,9,10,13,14 - so 8 in – but I cannot get the aggregate to acknoledge the fact that there are 4 per inpsire. So if I have one connected – it shows the four inputs. If I have two connected, it shows the four inputs. If I have four connected it shows eight inputs. Can I recreate the definition of the aggregate device? or any ideas on how to manage this?

Thx

Jon