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Is it through herbicide drift? I'm not clear on how it is happening, but you can probably find a nearby lab that can analyze a leaf tissue sample. A nearby university could point you in the right direction.

Make sure it isn't over or underwatered. It may be getting a fungal infection after it gets going each year, possibly clematis wilt. Here is more:

https://www.gardeningknowhow.com/ornamental/vines/clematis/clematis-wilt-treatment.htm

Clematis leaves appear in leaflets of three. There are no hairs on Jackmanii so you may have another type of vine coming up.

https://plants.ces.ncsu.edu/plants/clematis-x-jackmanii/

It looks prettier than a Tiaga. It's possible the grower had a small piece of Tiaga in with your plant and it just got large enough to bloom. Another possibility, and more likely, is that you have a sport. That is a mutation in the genes, and it happens quite often. Here is more:

https://www.gardeningknowhow.com/garden-how-to/info/plant-sport-mutations.htm

This is a severe bacterial infection. If you cut it without treating it, it will make the infection worse. Treat with a fungicide, and only water when there is drought.

These articles will help:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

https://www.gardeningknowhow.com/ornamental/vines/clematis/growing-clematis.htm

Yes, this can be normal. I don't see anything out of the ordinary. Just be sure that you care for it properly to ensure that it grows normally, and changes to the mature green color.

Here are some articles that will help:

https://www.gardeningknowhow.com/clematis