There is a virus that targets cryptocurrency users. It generates a large number of addresses and accesses the database once you copy an address from somewhere. Then it compares the copied address with its database anc chooses a similar one. When you paste the address to your wallet it will be the one from the malware database. It's best to always verify the address before you press send. It's possible that this is the root of your problem OP.

https://coinspectator.com/news/111967/cryptocurrency-stealing-computer-virus-cryptoshuffler-discovered-by-kaspersky