No labels are displayed in any task view, but the labels are still "attached" to the tasks and you can view the tasks associated with each label if you do a label query.
please try to clear your cache and/or force-reload the page using Ctrl+F5.
If this doesn't help, please tell me:
- Which browser are you using?
- When did you notice it for the first time?
- Are you accessing Todoist directly from the website or are you using a plugin/add-on?