As I said earlier - a lot of iPads/iPhones of older models. I/and some friends have tested at least 5 models. My personal is an iPad mini 2 program version 12.5.7
I/we have also tested different browsers. Safari, Chrome, Firefox and Microsoft Edge, no difference.
At the forum I found a guy who had some problems with PB. He had published his web site. https://researchexperts.co.tz/
For fun I went there. There was the same problems. A lot of zooming, scrolling that didn't work (compared to newer iPads or stationary laptops, computors.)
So finally it doesn't looks like there is any problem with the websites or the devices.
It´s a bug in the PB program that can´t handle older iPads/iPhones.
Can you fix it ??
Before upgrading to PB 5.0.5 – there was no problem
//Claes