Please be aware that 'pages' are decided by the settings you have made in User CP/options and one man's page numbers will not necessarily match another's. EG I see 95 pages at 'Forum default' setting. Firefox, however, sees 99, but only 95 'active'.
The problem lies, I'm sure, with the enormous number of rubbish posts deleted and the software is not keeping up with that. Waiting for senior mechanic to come back on this.