Weird -0.5% purchase bug

Hey,

Has anyone ever encountered a bug where you buy a shade and its automatically between -1% and +1%?

According to the app, I bought amazon at £1954.41 (or $2383) at 18:27 (or 13:27 NY time), however, amazon never got to $2383 at that moment.

There’s a 0.45% forex fee when trading US stocks.