Great zsh completion when using zsh & conda.

Just a little problem: when i tried to complete 'conda activate', it will always show all my environment variables before my conda env list. Something like:

My system is CentOS 7.9.2009, and I use oh-my-zsh. I have done following steps to install:

git clone https://github.com/esc/conda-zsh-completion ${ZSH_CUSTOM:=~/.oh-my-zsh/custom}/plugins/conda-zsh-completion

(add to .zshrc)
plugins=(… conda-zsh-completion)
autoload -U compinit && compinit