Two layers of text in PDF fillable document?

[Celine3140773470cd]

I created a form for students and most boxes work great, but some have another layer of text for no reason. See below. All text boxes are formatted with 8 size font, multi-line and scrolling text. Only a handful look correct and some like like below. Please help!

[try67]

You have two overlapping fields one on top of another, probably with the same name.