See https://www.mediawiki.org/wiki/User_talk:IKhitron
I clicked once.
Based on testing at https://www.mediawiki.org/wiki/User_talk:Quiddity_(WMF)#A_barnstar_for_you.21 the **steps to reproduce** might be:
# Go to Quiddity's talk page on mw.org
# Open Wikilove. Choose a barnstar from the drop-down menu.
# Press Esc to cancel. (Go do something else, e.g., scroll down the page or open a link in another tab.) (If you skip this step, then Wikilove works normally.)
# Open Wikilove again. Choose a barnstar from the drop-down menu.
# Press Esc to cancel. (Go do something else, e.g., scroll down the page or open a link in another tab.)
# Open Wikilove a third time. Choose a barnstar (maybe needs to be the same as the first one?) from the drop-down menu.
# Fill in the box.
# Send Wikilove.
# See two identical barnstars on the page.
# Refresh the page.
# See three identical barnstars on the page.
I've only tested this in Flow.