I have encountered a weird problem with my Macbook Pro (mid 2017/macOS Sierra 10.12.6). It shows the Location Services icon on the menu bar, many times a day, even after unchecking all application from location services except 'Setting Time Zone' & 'Find My Mac' (under 'System Services'). I have also unchecked 'Show location icon in menu bar when System Services request your location', that means 'System Services' can use location services without showing on menu bar.
Why does location icon show up, is there any app which is using location without my knowledge? I take my privacy seriously. or is it some malware/adware. Please see images: