Comment to Undo/Remove "Thank you!" from own comment
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The undo option for "Thank you", is disabled by default. If you want to enable that on your website you can execute this query in your UNA's database.
UPDATE `sys_objects_vote` SET `IsUndo`=1
Then clear the cache via Stuido->Dasboard panel. If you need to update likes only for the specific module - then the query should have a look like
UPDATE `sys_objects_vote` SET `IsUndo`=1 WHERE `Name`='[name of the module]' (like bx_albums or bx_events).