I have no idea how you managed this.

It you switch to Outline View (Window > View Quality > Outlines) you will see a large rectangle that extends off the page on the left. Select this and then look at the top right side of the page and you'll see a small symbol (two facing arrows) that indicates this is a repeating object.

Cut this to the clipboard (Edit > Cut) and select the option to Delete on All Pages.

Go the the page the form should appear on, right click on the page and select Paste > Paste in Place.