This is a confusing bug/feature hiding in every “build the sentence from parts” type of exercise. You can reproduce it by pressing number keys to select an item (which makes the numbers appear on buttons), then clicking on the small numbers with your mouse
Thanks for the report, the functionality seems to still work, as the number acts in place of the word. However, it is quite strange.
It reminds me of that joke when patients are numbering jokes and when talking they only mention the numbers
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