This is sort of a bug, and it has been up before with other currencies.
The Danish, Swedish, Norwegian, and Icelandic currencies are different - but all carry the same name: Krone, Krona, Krone, and Króna respectively. Their domestic abbreviations are: kr., kr., kr., and kr. (respectively or vice-versa, you decide).
However, internationally we use other abbreviations to distinguish these currencies:
dkr. = DKK
skr. = SEK
nkr. = NOK
ikr. = ISK
Currently Revolut uses ‘dkr’ for DKK but just ‘kr’ for SEK, NOK, and ISK. Please use the correct abbreviations - it quickly becomes super confusing to distinguish.
As an aside, the Scandinavian currency codes go after the number (+ non-breaking space in between the two).