Form on website autopopulating by url parameter but then immediately being cleared

Job ID: 33959281

Budget: $30 – $250 USD

I'm in the process of relaunching a website on a new server using update Wordpress and plugin version. I have many, many forms on this website. All of which can be autofilled by url parameters.

For a brief second, you can see all the data being populated and then it dissapears.

I fixed this once before I thought by moving one line of code from the header to the footer, but I can't seem to remember what I did.

I need this done ASAP, like tonight, like now. Can you help?