Why is text with same formattings rendered differently on the iPhone

[Nekom]

I experience a strange behavior where text with the same formatting is being displayed with different sizes on the iPhone (Safari)I have the following HTML:\[code\]<div class="page" id="thanks"> <div class="subtext"> <p> text tex text <!-- Being displayed with the correct size --> </p></div></div><div class="page" id="about"> <div id="about_us"> <div class="about_box" id="robi"> <p> text text text</p> <!-- NOT being displayed with the correct size --> </div> <div class="about_box" id="andrea"><p class="header">Robi &uuml;ber Andrea, 25</p> <p> text text text </p> <!-- NOT being displayed with the correct size --> </div> </div></div>\[/code\]And this is the according CSS:\[code\]body{ background-color:#ffffff; font-family: 'GaramondPremrProDisp', 'EB Garamond', serif; font-size: 17px; margin-right: 0px; margin-left: 0px; margin-top: 0px;}@media handheld and (orientation: portrait){ body{ background-color:#ffffff; font-family: 'GaramondPremrProDisp', 'EB Garamond', serif; font-size: 30px; margin-right: 0px; margin-left: 0px; margin-top: 0px; }}div.page{ min-width: 100%; position: relative; z-index: 50;}div.page div.subtext{ width: 68%; max-width: 1100px; margin-left: auto; margin-right: auto;}div.page div.subtext p{ text-align: center;}div#about div#about_us{ width: 68%; height: 900px; margin-left: auto; margin-right: auto;}div#about div.about_box{ text-align: center; height: 450px; float: left; clear: both;}\[/code\]As marked with comments in the HTML code... there is text which is affected by bigger \[code\]font-size\[/code\] resulting from the media query and text which is not affected. The strange thing is, if I write \[code\]all\[/code\] instead of \[code\]handheld\[/code\] in the media query and test it on a desktop browser... ALL text is being affected by the rule so I guess it is not a selector problem.I also tried everyting described in the answer of this question: Fix font size issue on Mobile Safari (iPhone) where text is rendered inconsistently and some fonts are larger than others? (without any success).edit: copied the described version to a folder in my dev environment which will not be affected by changes if you want to have a look at it live (veeeery slow): Check it out!