Film time randomly changed without notice?

My friend and I both got tickets to see Wolf Man at 10:15 this Friday, and while booking tickets for other movies later this week, I noticed that my ticket time had moved to 9:30 instead. I double checked with my buddy to make sure it wasn’t just me, and his ticket also changed. Neither of us got emails or any sort of notification of the change.

I’ve never had a showing randomly change times. Is this normal?