Based on responses, I've repositioned this question to ask why the subprotocols under my TCP header are not accounting for the sum of packet transfer. (I.E TCP= 97.1%, remainder of packet content not listed in subvariants/subprotocols)
Each hierarchical item contains subitems that should sum up to the same amount - however, there's no Other and that figure is omitted.
For instance, Internet Protocol version 4 contains (is the sum of) User Datagram Protocol, Transmission Control Protocol, Internet Group Management Protcol, Internet Control Message Protocol, and (omitted) Other.
Transmission Control Protocol just lists some subvariants that don't sum up nicely (there's a rather large Other).