Question: My shares show a decrease while none of my own stock companies have any decrease recorded, what gives?

Just yesterday I bought 2 shares of a company that returned me $100+ just yesterday. I maxed out at about $330, but now I’m showing $300 again, yet the stock is still rising slowly and shows no sudden drops at all. What gives?

Should I tap out and sell while I can? Should I hold onto it?

Edit: There was just a massive recorded drop and I broke just under $300. Im going to pull out while I can, but I still don’t quite understand why I decreased $30 with no recorded sign as to why in under 12 hours.