Nice interface, faulty content – Tsumego Pro (Go problems) Review

The interface is very reliable and easy to use. Considered as an app, this product is very nice. Unfortunately the quality control on the actual go problems is not great, especially at the Intermediate level. There are a number of duplicate problems. Solutions that clearly work are marked wrong, while suboptimal solutions are marked correct. It would be great to add a feedback channel so that there is some hope of correction.
Review by Dk31415 on Tsumego Pro (Go problems).