next time you're at bat against one of these, you may try moving less diligently / efficiently to the checkbox. overall, a slowed and less exact approach. I've not tested this enough to REALLY say it makes a difference, but in cases where I continually fail, going slower does seem to be the time I finally get through.
I find the same for the picture puzzles where you select images that match or apply to the posted context or whatever else the mission may be.
is that a thing? I've not received every form of email to exist in modern day, but how is a dynamically rendered email-body "too wide to show" on an iPhone screen?