That's obviously unlucky period of the season for you and your team has probably the most injured players at the moment. The good side is that all 5 players will be completely recovered within 1-4 days 🍀
Injuries rate is realistic, even reduced by some decent percentage.
It's probably that you have several highly injury prone players. If player is highly injy prone, he has much higher chance to suffer an injury in tough duel on the pitch 😀