Lite-on 1693s problem. need help

how dose this happen

If you mean how could they build and sell something, it can happen for a lot of reasons. Assuming good people doing the work, they could have had a supplier changing the specs on them without notice. It is also possible they don’t know what they are doing, but I am in no position to know. Most dealers don’t build these and those I have seen are very careful about the chips. A good dealer will stand behind what they sell.