I can't seem to be able to trade: instead of the trading interface that your meant to see, I get strange one where I can't actually sell/buy anything. I have a orbital trade beacon right in the middle of my stockpile, and a coms console. I am not sure how exactly to take a screenshot, so if anyone could tell me then i will take one.
F10 for screenshot and then you can easily find the screenshot folder from Options
and hit 'Open Save data folder' and it'll take you to the right place
Without a screenshot, given your information, I'd also check if your stockpile + orbital are outside (not under a roof).
Also modded or vanilla?
Problem seems to have fixed itself.