No worries - sorted now.
Unfortunately you got blindsided by a couple of things:
One is the "unusual" storage of historic data in OSM in Ireland (and particularly around Dublin).  Like the UK, Ireland doesn't have freely accessible address data, and arguably OSI and OSI are even more "secret squirrel" than OSGB.  The townlands project https://www.townlands.ie/ is an atempt to mitigate that, and from that sprang the recording of what e.g. Kingstown (the precursor to Dún Laoghaire) was in 1855.  These days a better home for this sort of historical data would be OpenHistoricalMap , but "getting from here to there" isn't trivial.
The other thing was an unfortunately poorly worded Maproulette task.  As worded, it was suggesting that the "place" value should be changed from a rare one to a more common one, without giving any thought to way the data was there previously and whether `place=more_common_value` already existed.
