It has nothing to do with register.php in terms of the plugin, in the Admin CP it's working directly on the PHP Output buffer, which I suppose if another mod is doing as well could cause issue.
Please go to the Admin CP -> Plugins & Products -> Plugin Manager
And see if any other plugins are on this hook: useradmin_edit_column2
Hint- if you have a lot of plugins press CTRL+F to open the "Find" function in your browser and paste in the plugin name to quickly search.
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