My manager texts me after work… and it’s getting weird

It started off normal. Just occasional work-related messages after hours. I didn’t think much of it because sometimes things come up. But lately, the messages aren’t always about work. Random check-ins, “what are you doing?”, “still awake?”, even comments that feel a bit too personal. I’ve tried keeping my replies short and professional, but it doesn’t seem to change anything. The problem is, I can’t tell if I’m overthinking it or if this is actually crossing a line. Because technically… nothing clearly inappropriate has been said. But the vibe feels off. And now I find myself stressing every time I see a message from them pop up. I don’t want to make it awkward or affect my work, but I also don’t feel comfortable anymore. Has anyone dealt with something like this?