THIS ARTICLE WILL HELP YOU:
Solve Blinking Issues
Are you experiencing a blink or page reload after installing the Convert Experiment Javascript?
Please verify that you installed the code in the header of the page, preferably after the </title> tag and before the </head> tag of your website.
This prevents the blink effect and the sensation of a page reload. In 95% of the cases this solves the problem. If this is not the case, please file a support ticket to support@convert.com.