Does anyone else have a long flowering Elder?

Several years ago I purchased "Johns" and "Adams" on line, they weren't labeled and only one survived. I found a 1" seedling while foraging in Wisconsin and planted that next to what I think is Johns elderberry.
The first couple of years not much growth, then shot up and flowered in LATE OCTOBER! The following year it flowered at the normal time and I got a huge crop from both elders, the fruits were very similar in size of berry and bunch, the new one however flowered a while after the original, this year it started flowering in late June (as my Black Lace in the front garden was finishing flowering) and still has fresh flowers opening near the end of August, that's 2 full months of flowers. Is this normal? If it isn't it might be a good pollinator for other varieties, or genetic material for extending the harvest.

Update. My elder continued to flower into October without fruiting as there wasn't another variety to pollinate it. However in late October it suddenly produced fruits, they are not yet ripe and may not be before the first frost. So either the other elder flowered (unlikely, as I would have seen it but this would indicate the growing conditions are responsible) or the cooler weather allowed self fertilization. I shall be saving the seeds if any viable ones are produced. I am also going to take lots of cuttings to try to propagate this elsewhere to see if flowering is extended still.