The ipad onscreen keyboard changes position:fixed style to position:static that misplaces those elements and you'll have problems on each page with a form, e.g. search field.

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

• Prevents you from data breaches and liability risks
• Upgrade at your own pace
• Works with modern Rubies

Read more Show archive.org snapshot

There are several workarounds/hacks but no straight forward fix yet. Expect additional expense.