My hairline is receding even through I am on finasteride

I am using Fin for past 5 month with no sides. I had usual shedding phase for a month which stopped after that. But the problem is, I am losing my hairline fast after starting Fin. My hairline has been constant for past 3 -4 years. But in these 5 months my temples became easily visible as my hairline went high. Is this expected? Why is this happening?

Finasteride will not always stop a receding hairline