Newbie Tesla Invest Share Split Query

Hello everybody,
I am new to trading 212 and invested a small amount in Tesla (0.011 fraction of a share at £13.19p) back in July 2020. Now I wasn’t expecting a large return on this but just taking my first foray into stocks and shares.
It seems as though this stock has been removed from my account over the weekend and has been replaced with a deposit of £5.39 on 29/08/20. Before this happened my stock was up and was providing a return. Does anyone know why I have suffered a loss of £7.80 on a healthy stock?
Kindest regards

You bought your fractional shares for a higher price than the price at stock split? Also GBPUSD is probably a factor. USD is very weak lately.

Look up your history and compare the prices and foreign exchange rates.