Your TLD as well as your domain is already implicitly specified (as you can't change it anyway), you only have to specify the subdomain.
What you actually did was to create ts3.pixel-pushers.net.pixel-pushers.net which works just fine as expected.
So the solution is simple: change the left input field on the A record to just ts3 and it will work just fine.
Also once you fixed that you will also be able to connect to just pixel-pushers.net
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