Am I stupid that I’m missing something or Flippa is scam?

So I want to sell a domain on Flippa.
I've verified the ownership of my domain. Then I listed my domain. I choose classified domain at 1$ standard price. I go to pay and… I face an error.
I think: Well, I remember I had money on that paypal account. Let me try again.
I try again… but it doesn't work. It say there is another paypal payment going on. I wait 5 minute. Same error. Contacted the support. No answer. I wait 10 minute. Same error.

So I make another project, I try again with…

Am I stupid that I'm missing something or Flippa is scam?

Am I stupid that I’m missing something or Flippa is scam?

So I want to sell a domain on Flippa.
I've verified the ownership of my domain. Then I listed my domain. I choose classified domain at 1$ standard price. I go to pay and… I face an error.
I think: Well, I remember I had money on that paypal account. Let me try again.
I try again… but it doesn't work. It say there is another paypal payment going on. I wait 5 minute. Same error. Contacted the support. No answer. I wait 10 minute. Same error.

So I make another project, I try again with…

Am I stupid that I'm missing something or Flippa is scam?