Hi,
I am still experiencing this issue. I updated my Chrome browser to the latest version (I had not been updated previously) in case that was the problem. Today I went to check the pop-up form again and I am having the same problem. I took a screenshot this time so you can see what I am seeing (link to image below).
https://ibb.co/JHJ49wq
As you can see, the filler text still appears behind the text I added. This is what happens after I hit submit – it shows that there is an error with my email address.