I installed oh-my-zsh and now every time I open the terminal some characters display instead of the prompt. However, when I start typing something, the prompt shows correctly:

Last login: Wed Oct  5 14:02:50 on ttys000
P~
Last login: Wed Oct  5 14:03:27 on ttys000
P~?
Last login: Wed Oct  5 14:03:37 on ttys000
P~3
Last login: Wed Oct  5 14:04:09 on ttys000
➜  ~  ls
Desktop   Documents Downloads Library   Movies    Music     Pictures  Public
➜  ~  

How can I fix this?

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