Pls check with generation log whether its related to time .Also, make sure that, only last 3 or 4 digits only changes in the timestamp number. if each number is different, then its not a timestamp. If you are sure it is a timestamp , you can use web_save_timestamp_param function before each hits where timestamp value occurs.
What you have in your sample code is a typical way web based applications pass variables from page to page, but LoadRunner is only telling you that the page you requested was present. So "ts" is the variable throughout your application being tested and each of the numbers are the values being used on those pages. Your developers should be able to explain how they are used. If they're dynamic you'll need to correllate them. You can't trust LR to send back any errors or failures for invalid URL variables unless you have error checking in the script code. Since Mywebpage.do is a file and does respond to a request to that file LR will report it as success. The page may be working as you expect or just be one big error message, but unless your script is specifically looking for a valid response you won't know.