Comments on export

Hi Guys,

I noticed something strange on the export feature.
I always use this export to save my config after changes, so I always have the latest state of my devices.
Now I just noticed that when I apply a comment to a wireless interface, irrelevant what that comment is, it appears multiple times over several locations of the configuration.

/interface wireless
set [ find default-name=wlan1 ] comment="Hardware interface, only used as master-interface" name=Base2Ghz 
add comment="{traffic} {reg-count}" master-interface=Base2Ghz name=Private2Ghz security-profile=Private ssid=<MYSSID> 
<... I have more like these ...>
/interface wireless nstreme
set Base2Ghz comment="Hardware interface, only used as master-interface"
set *A comment="{traffic} {reg-count}"
set *B comment="{traffic} {reg-count}"
set *F comment="{traffic} {reg-count}"
/interface wireless manual-tx-power-table
set Private2Ghz comment="{traffic} {reg-count}"
set Base2Ghz comment="Hardware interface, only used as master-interface"

Now I do understand that the comment is saved on the physical or logical interface, but why does it also appear on other parts of the config.
I did not set it there, it just is there automatically after setting the comment on the interface itself.