I know what I'm doing.
Doesn't seem like it..
Not sure how helpful it is for you but have a look at this thread and how I got hacked off my Electrum wallet when I knew "I was doing everything right", I wasn't. The address that you copy-paste on your website if seen on a block explorer, does it show the funds you received? Does it show any transactions at all?
Will be helpful if you link to those addresses and transactions.