Incorrect path weight

[Evgeniia6C13]

Hello! Illustrator says that both paths weight are 0,1 mm. First one is part of expanded blended object. Obviously this first path is much thicker than another. How to make Illustrator to change paths weight correctly?

[Monika Gause]

Please show screenshots with the appearance panel.

Please embed screenshots in your post.

[Evgeniia6C13]

Thank you! I've found my fault on appearance panel.