Muted and some weird ::theshop glitch

[Lmfao Babe/Dharo6]

My sisters account "Lmfao Babe" was supposed to be unmuted and she is not!
Also, there is a theshop glitch

When i sell an item when 1 slot is left and someone else does it at the same time, the worldscape client automatticly closes and doesnt let me open it for 10 minutes! Please tell me what i should do :(