Spaces being removed from between words when using dynamic population

I'm using dynamic population to pass on the name of an event (essentially the post title) to a single line text field in my form.

The field is populating with the correct data, however the spaces between the words are being removed. How can I prevent this?

I'm using the Query String method.

Thanks for the reply. It was my error, the page slug was wrong for some reason, which caused the spaces to be removed.