Network Profiler - 1 Byte Variables

Anyone able to answer this perhaps? To re-iterate the question:

I did Network profile tests with RPC’s (Custom Event, Run on Server).

A RPC with a DataTable variable shows as 1 byte, but the bandwidth spikes to 15,000 bytes.

A RPC with an Int variable shows as 4 bytes with no noticeable bandwidth spike.

A RPC with a Vector variable shows as 12 bytes with no noticeable bandwidth spike.

A RPC with an Actor variable shows as 1 byte with a bandwidth spike to 6,100 bytes.

I understand there is some stably named references in some cases but I am hyper-optimizing network traffic and I am curious what is occuring with the bandwidth.