I find myself welling up pretty much every episode of The Crown.
Is the show that sentimental?
Each episode there are three or more tear-jerking moments.
The show must be very moving to make you cry, it's understandable to get emotional watching tv sometimes. Make sure to keep some kleenex handy.
I don't want to admit that it's causing me to cry every episode; I want to say it's the writing.
It's okay to be moved by shows that you watch. For one thing, they're likely written with that intention, and for another, it's good to normalize showing your emotions.