The merchant fleet window does not resize itself correctly when you have a fleet of merchant ships and another fleet of freighters.
To reproduce the issue have two separate fleets as above. Click the chevrons below the merchant ships to display the cargo. Notice that the chevrons below the freighters disappear - they are cut off. Normally the window should resize itself within a few seconds; I waited far longer and it did not. An easy work-around is to switch to a different browser tab and switch back.
Browser is Chrome Version 111.0.5563.111 on Windows 10 x64