I am seeing strange behaviour on the 'Tasks' and 'Projects' tabs under the My Account section (i.e the tasks and lists view that show up when the user selects 'To Do' from the 'My Account' drop-down menu). On this view the sidebar disappears, as well as the container background, as you can see in this screenshot.
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I am using a child theme which I have developed for the Buddypress default theme, which switches the sidebar to the left. I have confirmed however that the same issue occurs with the default Buddypress theme.
Would it be possible for you to fix this?