The incense was burned by incense ashes to the ring finger of the right hand and burned twice. What does this mean?

First of all, maybe you accidentally burned yourself, which means nothing.

Second, you may burn incense or do something not so good at ordinary times. Buddha, Bodhisattva or good god protector will give you some hints.

Either way, I don't think you should think too much. Just do more good deeds at ordinary times.