After doing Parameterization values are not getting displayed in the application. example: while creating data i use first name abc and lastname 123 then i parameterize the values in the script. with abc1 and 1234. the new values are not getting displayed in the application.
You should check your script in NeoLoad as it may still contains information related to the recorded user abc or/and there are some dynamic values that you did not handle and the script is not really working fine.
Use the compare requests/responses feature in the check virtual user panel to see when the server responses are not the expected one anymore.