Henrique Goldmann

I recently opened my account with IBKR and DAS. I currently have 100K of BP, but I noticed that I could not use all my buying power in a few stocks. For example, when AMC was trading at $30, I could only purchase 1,000 shares, using only 30,000 from the buying power I had available. This is confusing to me because I didn't have any restrictions in the simulator when using my full Buying power. Am I missing something? why do i suddenly have this restriction Thank you Henrique