What should I know about the Digital Arrival Card and immigration process when arriving in Bangkok?

I question for anyone who has just arrived in Bangkok by air. This may be a little long but I still confused by the immigration officers response.

I arrived early this morning from the US. Going through the immigration line and the officer looked at my passport and the Digital Arrival Card. I did the DAC at home and going through the questions, the boxes for “ where are you staying” and “On ward travel or return flight” were grayed out and you could not enter anything. So I tried it twice same thing. I went ahead with the process and it let me. Within minutes I received the email as completed and then printed it out which was one page. I also copied the QR code.

When she saw the DAC paper work she asked “ where is the second page, where are you staying and how long do you plan to stay. I am staying with a friend and had the address. She also wanted their name and phone number which I had. I had booked a flight to Cambodia out about 55 days in case I was asked this. I had planned on 60 days visa eexempt and possibly applying for the 30 day extension. Long story short she called my friend, apparently ask our relationship, ask how long I was staying and then told them they would need to take me to immigration ansi would need to get a Visa to stay longer. Now mins you, she only told them this and did not tell me. She finally stamped my pass port and I met my friends outside. They then told me what she said and none of us understood why she would say I need to go to immigration and get a Visa.

So if anyone may have an idea or if you are flying in just be aware of what they may be looking for on the DAC and hopefully you do not have the same issue. Thanks