United Kingdom, Jan. 8 -- Ashley Tisdale's mom group tensions stemmed from a "misalignment of values".

The 40-year-old actress has suffered a public falling out with some high-profile friends, including the likes of Hilary Duff, Gaby Dalkin, Meghan Trainor, and Mandy Moore, and an insider has now explained the cause of the tension.

A source told People: "It was a misalignment of values that Ashley decided to make public. Friends naturally drift apart. It didn't warrant a dramatic breakup text."

Ashley - who has daughters Jupiter, four, and Emerson, 15 months - recently discussed leaving her "toxic" group of mom friends in a blog post.

She said: "Here's the thing nobody prepared me for: Mom groups can turn toxic.

"Not because the moms...