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Try this: Go to View > Extras > Hide Assigned Frames.
1 person found this helpful
What is the shading options you have set for that frame?
This line is sometimes made intentionally by users to have a border on one side of the text. You can check the same.
Below is a screenshot showing how i replicated the issue.
As far as i can see, your case seems identical.
Thanks everyone for your help - AnnMarie's answer was the one that removed the shading. Thanks again!!! I have no idea how this got turned on.