One issue may be that pin/unpin is grouped with other admin actions, but a separated pinned symbol is shown when items are pinned
there are two paths one could take in design
a. could make the pin flag clickable by admins to unpin (if it's not already)
b. could remove pin/unpin from admin actions ui group and instead make the pin flag icon a toggle button showing/toggling unpinned/pinned state. For normal users only pinned state would be shown (no unpinned icon) and they wouldn't be able to click the pin to unpin it