Searching usernames to add to project - name does not appear in the dropdown results

Platform/Browser (Windows 10, Firefox):

Description of problem

Step 1: Go to iNat Project

Step 2: Select “Members”

Step 3: Select “Invite new members here”

Step 4: Type in username into search bar.

Problem: When a full username is submitted as a search string e.g. “treehu” (see: screenshot), the search function returns many results of “treehu*”, but none of the results are the string itself. The search results are not paginated, so the user can only select from the top results suggested by the search function. How can one invite a user to a project in this case? (FWIW, the username is spelled correctly and does exist). If one simply types in the username and clicks “Invite”, the search returns “Invited user can’t be blank”.

Thanks for any insights you might have!!