I'm referring to at least three cases where you have edited Estonian border to deviate from the official border in the past:
https://www.openstreetmap.org/changeset/62084029
https://www.openstreetmap.org/changeset/102637842
https://www.openstreetmap.org/changeset/48708810

For reference, here is the actual country border in this location:
https://xgis.maaamet.ee/xgis2/page/link/sQ3uyUO
And here is the object history showing your "shaping" work, and also the DWG action from 2014:
https://pewu.github.io/osm-history/#/way/129854854

I don't know the exact reason behind the DWG action but most likely this is due to https://wiki.openstreetmap.org/wiki/Names#Name_is_the_name_only
"Latvija — Eesti" isn't a name of any kind, and also "left:county" and "right:county" already store this information in more clear manner.