Existing threads on same issue that have different solutions:
https://discourse.roots.io/t/browsersync-reloading/10427
https://discourse.roots.io/t/problem-with-browsersync/13932
and probably more if you continue to search. I’m locking this thread as it’s old (and you’re also not using Docker), and you should be able to figure out the solution from existing threads. If you can’t figure it out, please start a new topic!
Maybe start by trying to remove the / at the end of your devUrl (ref https://github.com/roots/sage/blob/19057f60be1a5ecc466b2a0a1cb0eca0d367bb6e/resources/assets/config.json#L12) — then check to see if anything is already running on port 3000. If there is, kill it or change the proxy port in the config.