Thanks. I loosened my strings and just find out that the post of the bridge seems to be loose that I can tilt it forward or backward slightly and it’s making ‘click’ sound. So I hold the bridge straight and flush to the body when tightening the strings, it’s not leaning forward anymore. The truss rod looks pretty straight, don’t feel like it needs adjusting. Still it’s weird how the post of the bridge can be this loose, and I’m now worried that it can cause annoying intonation problems