Strange sram overflow outcome

#1

So i have this patch with 16 wave/play objects that when going live returns an sram overflow by 68 bytes.
Just a patch to check how mutch sram an object uses.
Now i made a mix object that just has 6 inputs , no bus or gain.
I added it to the overflow patch to see how many sram i save compared to the normal mix 6 object and when i go live i end up with an overflow of 60 bytes.
That is 8 less by adding an object.
How is this possible?

#2

and with an extra object i get an overflow by 76 bytes