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The following URL is self explanatory. It is trying to generate a QR code requesting 0.005BTC at the shown address
http://www.btcfrog.com/qr/bitcoinPNG3.php?address=31oLAAQDmuRAGfkviHPDXFgV15To4idott&size=200&label=xx&message=yy&amount=.005
This generates the QR code below
When this QR code is scanned with any wallet of your choice the receiving address switches to something else! The address is clearly owned by someone and has several transactions.
Is it hacked or I'm doing something seriously wrong?

2To add to that: avoid even searching for a bitcoin-specific QR generator, just use a general purpose one if you must. You're less likely to find scams that way. – chytrik – 2019-06-22T19:10:48.113