As I read the OP: guy used twins and put both bl. and red on same breaker...
Then ALL of the associated neutrals are overloaded. They've got 15A Black and 15 A Red out bound -- and 30 A coming back on white as they are from the same phase.
NO WONDER HE'S GOT TROUBLES.
The 'twins' split the OCPD -- but not the phase.
After correcting the neutral trouble...
Kill all of the breakers and shift the blacks and reds such that they hit alternate phases. Do this ASAP, before more damage is done. As it stands, your neutrals are being cooked.
