Looking at others results on here it seems to be relatively common for this to happen.

For example I did "the quick brown fox jumps over the lazy dog" > "The fastest dog is the fastest dog"

It might be caused by words that are compounded from two words that now have similar meanings, such as Wolfhound or Taxicab? Those words could sometimes get translated to two separate words in another language

For instance, Google Translate from English to Chinese and back to English does wolfhound > 狼狗 > "wolf dog"