Hi Amy and welcome
Sounds like your dog is far too excited and just hasn't got time to run right up to you and jump.
Can you tell every time when he runs back when he has found something? If so, then you can have this as your alert and just explain that you know he has found by his body language.
One of our dogs, Guinness, used to jump up as an alert but that took too long for him. So now he runs at us at a million miles an hour turns on his heels near our feet and dashes off at a million miles an hour. He will only do this when he has found and also you can tell by the position of his ears and tail. They will always be up when he is searching but when he alerts they will be down. If you too can say this every time then that is ok. Just shows how well you know your dog.
I know how hard training an alert can be. i am training Scrumpy to jump but sometimes he gets over excited and jumps up and false alerts. Grrrrrr
The rest of our gang are at training at the mo but I'm sure you will get more hints and tips soon.