What went wrong for the allies on d-day?

On D-Day, while the Allies executed a well-planned invasion, several factors contributed to setbacks. Poor weather conditions delayed airborne operations, leading to paratroopers landing far from their intended drop zones. Additionally, German defenses were stronger than anticipated, resulting in heavy casualties, particularly at Omaha Beach. Coordination issues among the various Allied forces further complicated the operation, leading to inefficiencies in achieving their objectives.