I replicated this by selecting a lot of questions, adding only 10. Then I went to replace all of them. On the replacements list, I clicked "select all" then started individually deselecting items in the list. The number of how many fewer I should select increased.
Overview
As reported by @ozer550 on Notion
I replicated this by selecting a lot of questions, adding only 10. Then I went to replace all of them. On the replacements list, I clicked "select all" then started individually deselecting items in the list. The number of how many fewer I should select increased.