This is not an error – it’s expected behavior. In PMI, the Save button acts as an on-screen indicator of whether any changes have been made:

• When changes are made, the button becomes active (blue) — prompting you to save.
• Once you’ve clicked Save, or if no changes have been made, the button returns to its grey (disabled) state.

This visual cue ensures users don’t accidentally re-save unchanged data and helps confirm that changes have been successfully applied.