random line ...

I have been making a leaflet of sorts using a table layout and a blue line has appeared with no apparently way of getting rid of it. the line crosses across the center of the whole table. But it doesnt seem to be related to the table or border, since those settings change nothing and it isnt realted to paragraphs in anyway, so im wondering if anyone knows what it is?

(https://postimg.org/image/4e360549b/)