blowout means, the coach tries to rest all starters, since F is replacement for D I as backup is free to replace either c or e so he will come in for one of them or maybe few minutes for c and e.
But this is a normal behaviour, you can avoid it in putting I as reserve(or backup) for C, since then he will sub as priority for c which is possible and the coach is pleased to rest as much starters as possible.