Looks like you spent a total of 4.464 SBD on 2018-2-11:

2018_sbd_exchange_transfers.csv:mondoshawan,blocktrades,4.4640,2,11,2018

I think that's where the 3.60 comes from:

2018_STEEM_and_SBD_investors.txt:mondoshawan                   ($            3.60)

But what confuses me is the historical price listed for SBD on 11/2/2018 is 0.9797255 so it looks like something is off there as I would expect that to be 4.37 (4.83 * 4.464) not 3.60.

I may have to dig into this a bit more. Thanks!