I think it’s normal.

I made a similar move a few years ago, from 10+ years at the old job. There were red flags that came up a couple months in, but I decided to stick it out.

It took me over a year to really feel like it was the right decision. But the red flags faded as it turned out there were just some growing pains going on. Leadership managed to resolve the major issues and I’ve turned out to be pretty happy in the new position.

I’m not saying the same will be true for you… Some red flags signal issues that are correctable, but others signal toxicity or other things that are unlikely to be fixed.

But IMHO, 3 weeks seems like a short time unless the issues are really egregious.

Also consider that if you go back to your old job, your old boss may treat you worse than previously.

If you don’t like the new job and don’t want to give it more time, consider starting to look for something new immediately (you were headhunted, so your skills are obviously desirable) and continuing to move forward rather than going back.

My 2c.

This is what happens Larry, when you find a stranger in the alps.