3 of 4 ordered chairs with very strong flawed !!! - Coincidence ???

may be the chance ??? - Used material seems to be not so bad - chairs are robust and quite comfortable in construction. However, and that is what matters just as if not more important to the process. This is in my supplied chairs totally unacceptable and I am not there so fussy and eighth necessarily on every little thing. Ordered, shipped quickly, unpacked and set up and the first still very satisfied ..... but after that only garbage. The second chair was highly contaminated textiles in the seat / backrest, hand big sticky bit, no idea what that is. The third warped and wobbled severely and suddenly fell during the fourth sample sitting on plastic caps and as I wanted this reinserting it I could see that the glands were partially not run properly under the seat. Screws partially wrong or so strongly attracted the the underneath lying plastic ring was broken. I then checked out of curiosity times all other chairs and up to a all the same quirks more or less. Absolute no-go.
The fall already when setting apart and how does it hold for years only?!. I hope that I've just had bad luck with my but due to the many shortcomings can I believe that hard. Or is here to returns which more likely would be because everything else (and that) would be an outrageous impudence on customers. I can recommend these chairs no further and will now take another if only because Amazon can not provide replacement and pay me my money back.