Board Thread:Support Requests - Getting Technical/@comment-5645428-20170311020252/@comment-168424-20170316174707

Hackey5 wrote: It does not happen on any PC browser based on any configuration of screen width I've managed to give it. On my iPhone 5 Safari browser (up to iOS 9) this takes effect. For an example, you can use this thread. Observe the size of the comment body text; typically 14px, it is enlarged; compare it with text within the navigation bar. The upper menu by default is 15px, and the second level menu 13px; the body text is significantly larger than both. Then observe the 28px thread title, which the navigation subtitle text, also affected by enlargement, and you can see that it comes a lot closer to 28px than 14px would suggest. Also scroll down and check out the rail modules, whose text looks comparatively a lot smaller although its sizes are unchanged.

A separate indication that shows the 'invisible' changes to the browser include the Preview and Reply buttons being increased in size. If you can observe that, the body text has likely been enlarged also.

Your explanation sure makes it sound browser specific. Try grabbing a different mobile browser and see if it repros.