When merging rems, tags are added even when they bear the same name, example below :
However, when I try doing that manually (meaning applying a ##biology two times in a row on the same rem), remnote does not allow it.
This leads me to believe that the behaviour in the image above is a more a bug than anything.
I decided to report it, as it is exhausting to have to deal with this: I have to merge dozens of rem weekly and then “clean” this stub tag dozens of times…