ota-tools | burgeoning collection of tools for Over-The-Air distribution | Dataset library

Somewhere you're sourcing the whole of the bash_completion project - don't. Bash completions don't work in zsh and even if they did, they are worse than the native zsh ones. bashcompinit is only useful with individual, carefully selected and tested functions. But is still better avoided.

It isn't clear where it is being sourced. The syntax highlighting plugin is unlikely. oh-my-zsh shouldn't be doing it either but I'd try disabling it first. Also check other startup files like .zshenv, .zlogin, .zprofile and system files such as /etc/zshenv.

Also, regarding the .zshrc you quoted: there's no need to pass +X to autoload, that's pointless. The second assignment to the plugins array is replacing the value from the first assignment. Did you want += instead? And if you want $ for a a normal user in the prompt and # for root, you can do that directly with %(!.#.$)