Does not open chat box and inventory when trying to enter a nether portal

When i'm inside a nether portal and type "T" or "/", the chat box does not appear so I can't type anything on singleplayer and multiplayer and Inventory disappear when entering a nether
portal, sprint and jump and press E and on to the nether portal and Inventory disappeared
Can't open chat box and even inventory and on multiplayer it says i need to login but im in a nether portal on spawn and i press t or / does not open the chat box and i would be stuck there forever and i don't know if the admin can teleport me out of the portal or break it because i don't know about it.