Do you mean a "long press"?
What version of iOS does your 7s have installed? Is it a different version from all your other devices?
Yes "long press".
One of the iphone 7s is running both the most recent version of iOS and the others were one version back. The most recent version being 10.3.3.
Other devices we've tested this on (iphone 6, 6s, 5SE) are all running 10.3.3.
What plugins do you have installed?
We use a software platform called Alpha Software to do our app development. Then we submit it to Phonegap. This is where we initially discovered the issue.
However, to eliminate Alpha Software as the source of the problem, we went to the Phonegap website and followed the instructions there to build the "Hello World" app and run it on the iPhone 7. The problem appears when running the "Hello World" app (modified to include a textarea).
I'm unsure how to determine what plugins are installed. However, the attached photo shows the contents of the Hello World plugins folder.
Disabling "3D Touch" on the iphone 7 resolves this issue.