Problem with /m and ! on server

Hello, I’ve been playing on the Mine Planet server for a long time and until today, I could freely write commands in the chat! and /m. Today they stopped working. Writing ! and text in Russian. The text remains, but the command ! is automatically deleted. Thus, my message does not reach the global. The same problem with the /m command. I write: “/m nevaleva hello, Nev, how are you?” the text remains, but “/m nevaleva” is completely removed. Because of this, the player nevaleva and other players cannot receive my message. Please help me solve this problem. Looking forward to your reply. Maria