I often found that the best chippies were run by Italians and the worst by Chinese.
Not a racist thing just from personal experience.
The Italians would drop the basket of dried chips in the oil, wait a little then pull the basket out of the oil, let it heat up again and give them a second dunking. The Chinese just dropped the basket with still damp chips into the oil once, guaranteeing sogginess.
I have noticed that is as well but it leaves me puzzled as to what they are trying to do.
A chip shop pan is large so that putting cold items in do's not cool the fat much but if the chips are kept in a basket then there is a dramatic local cooling of the hot oil, chips in the centre of the basket will get less cooking.
Chefs do cook chips in two steps, they put them in the hot oil (in a fryer smaller than a chip pan) until starting to show colour, take them out, and spread them out to cool them very nearly cold, then back in the fryer until well coloured and crisp, to get the potato inside the chip just cooked.
The Chinese, putting wet chips in the pan are taking a big risk (flying hot oil), and they will knock the pan temperature down taking longer to fry the chips.
All the chippies I have talked to say customers don't like crisp chips!