Arrived into PEK for a first time visit to China on an L visa and I did not get an entry stamp in my passport. My wife does have one in hers. When checking into the hotel the staff looked weirdly at it, but in the end checked us in. We have a couple of domestic flights and hotels stays in Zhangjiajie and Xian before we leave, is the missing stamp going to be a problem for these or leaving the country?

Any advice about what to do about this, should I head back to the airport?