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this isn't a cache issue. seems you have misunderstood

we are not talking about reading a thread in full, hitting back and it's still bold and then refresh and it's not bold (which is the browser cache yes)

we are talking about not reading a thread in full, hitting back, refreshing and it's not bold when it should be bold

its a bug in how xenforo works out if the thread is fully read or not, the fact it only happens on the second to last page, is possibly a good indicator to what's wrong