Its possible the RAM you got is fake!
A new scam is happening where lower quality (lower spec’d) RAM is substituted for the real.
We have seen an large up tick from Apple chargers [https://9to5mac.com/2016/12/02/fake-apple-chargers-dangerous-99/|Safety tests of 400 fake Apple chargers bought online reveal that 99% are dangerous], 2.5” SSD’s like Kingston [https://www.ukantipiracy.co.uk/computer/fakekingstonhdd.html|Fake Kingston SSD] and of course RAM! [https://www.reddit.com/r/buildapc/comments/63x9ir/warning_lots_of_fake_ddr4_ram_listings_on_ebay/|Warning lots of fake ddr4 ram listings on ebay] as well as Amazon.
Best to return it and buy directly from the company that makes the RAM.