Same issue, and also the entire review disappears, meaning don't write a review unless you either copy into clipboard before posting, or are 100% sure your nickname is available, and the App store is bug-free.
Writing this, by the way, and using the arrow keys on my Apple-recommended Logitech Type+ keyboard autoscrolls to the bottom of the page; regardless of which arrow key is pressed.
Dear Apple,
You are losing a customer next time I need to upgrade my products unless you change your attitude towards customer service. Updating to iOS 10 was a bona fide disaster. As a customer I need to be able to look forward to using your products, not rue the gauntlet I have to run whenever an update is in the making.