younis - You are correct it is a mysql issue. a smallint has a range of 0 to 65535.
You can set it to just int and that will solve your issue or you can use mediumint - either will fix your issue. int may be more than needed but will assure you won't have any issues....
Sorry, to be more precise, it's the Tread Views of one of my Forum's threads that has reached the 65535 limit. Which MySQL database file/entry do I change to mediumint?