Hi, thanks for reporting this!
We have had a few reports of issues like this recently. As far as I know, there hasn't been any increase to the number of injuries in any recent update - you have had an uncommon number so we think you've been very unlucky. I have raised the subject with our development team who have decided to put a cap on the number of players that can be injured at one time. Following the update that will be released soon, you will only be able to have 5 players injured at one time.