Vue 2 with Vue CLI reactivity problem

Hi, I’m developing a frontend with vue 2 (old freelance project which require maintenance) and reactivity is not working. In network I saw this https://10.88.0.4:8080/sockjs-node/info?t=1728002709342, aparently can access to https://10.88.0.4:8080. Any ideas? :c I imported that repo from github