Well, i've got an answer to my issue. i'm going to log it here in case it will help someone else.
To Disable the Caching in PDF Forms
Forms saved in PDF format with form fields that may be completed online are sometimes cached by the browser. That is, when a user completes a PDF form online, the information entered in the form will appear the next time the form is opened in that browser. The information should be cleared the next time the form is opened for information privacy, especially if the form might be completed at a public workstation. Using Adobe Acrobat 6.0 Professional, follow the steps below to disable caching (storing) of information entered on the form.
In the Script Name field type init and click the Add button.
Delete the automatically generated text that is displayed in the script window, and copy and paste or type the following code in the exact format (line wraps are fine), click OK, then click Close:
var bReset = false;
var url_re = /^http:\/\/|^ftp:\/\//i;
var isInBrowser = false;
if (this.external && url_re.test(this.path)) isInBrowser = true;
Click View, point to Navigation Tabs, and then click Pages.
Select a page thumbnail then click the Options button.
Click Page Properties from the Options menu.
In the Page Properties dialog box, click the Actions tab.
From the Select Trigger drop down list select Page Open.
Click the Add button.
if (!bReset && isInBrowser)
bReset = true; }