Here are a few things to check/try:
(1) Upgrade your galleries to SimpleViewer-Pro v2.3.1. This will ensure that any bugs which were present in previous versions but which have since been fixed are not contributing to the problem.
(2) I notice your web page includes a very old version of jQuery (v1.4.4) which is now over 3 years old.
SimpleViewer should use its own version of jQuery (bundled within the 'simpleviewer.js' file) but try upgrading your version of jQuery to the current stable version (v1.11.0) to see if this makes a difference.
(3) Your galleries seem to be embedded into an iframe and the page loaded into the iframe loads two custom CSS files ('stylesheet.css' and '/styles/layout.css').
There may be global CSS rules within these files that the SimpleViewer galleries are inheriting and which may be affecting the layout of your galleries. Try temporarily removing these CSS file (or look for CSS rules which may apply to all div, img or p tags, for example) to see if this helps.
(4) Check to see if our own sample gallery here: http://www.simpleviewer.net/simpleviewe … es/modern/
... suffers the same problem under iOS 7.
If you see the same problem in this gallery, then I can log a bug report with the developers but, unfortunately, there may be little that can be done to fix the issue until it is addressed within the SimpleViewer core files.
SimpleViewer Support Team.