It is important to note what fiat or crypto the transactions are set to display.

For example, if set to USD (U.S. Dollar) the transactions will be shown from the perpective of U.S. Dollar.

If you buy 1 LTCUSD - You are buying that Litcoin with the amound of USD indicated by your purchase price.  Let's suppose you bought your LTC for 59.02.  If you look at this transaction with USD displayed it will show "Sell 59.02" because you sold 59.02 of USD to get 1 LTC.

If you look at this transaction with LTC displayed it will show "Buy 1.0000", meaning you bought one LTC.