As a test I bought 2 shares of SNAP a few weeks back, I chose them for various reasons. They had a huge uptick recently and those 2 shares worth £10 along with S&P500 1 share at 40 said my portfolio was at £104. I effectively doubled my input. Today before market open I wanted to put £50 into SNAP (for similar reasons as before). I did so successfully and my portfolio still says £104? Should it not be at least 154?
Since buying the extra 7 shares for £50 my portfolio is identical