So I found out today that the dividend income reported in Sharesight differed to what was deposited into my Selfwealth Account. After talking to SelfWealth Support they directed me to the below article.
Blockquote A small processing fee is also applied to US dividends. The fee is distributed across all holders of that stock, therefore is not a fixed percentage or dollar amount.
I cant see a way to easily record this discrepancy for tax time in Sharesight.