Advice please!! Bad Condensation (windows are not blown)

We’ve been in our house for nearly 2 years (first time homeowners). When we’re in winter, the front of our home windows look like this! The windows are not blown, it’s just condensation, but from top to bottom 😖 The back of the house isn’t like this at all.

Can someone tell me why this maybe happening? The house was built 1970. Any help/advice is much appreciated!