Not a major bug this, but if you (temporarily) allow the selection of some themes, then remove them from being selectable and change the default theme to something else, Discourse sticks with the previous user-selected theme even when it has been made no longer selectable.
I am pretty certain this is a staff only issue, we run a security check. Fixing this for staff is annoying, but doable.
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In that case I wouldn’t worry Sam, in fact there may be some benefit leaving it as it is 
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