Thanks for sharing, I joined Imgflip last year and learned that few months ago. Upvote this image so more people can see it, it’s helpful!
(The save text box setting is on the bottom of the page)
Here's how to set up text boxes correctly for anyone making templates; 1st: Go on a template you made
2nd: Set the text boxes to where you want them
3rd: After setting them up to where you want them, click "Save Text Box Settings"