Now to my issue: I am in the process of building a shipyard in Second Contact VII. At some point, I noticed that the build progress had stopped, necessary resources were missing. Looking into the resources overview on the build menu, I could see that all the required resources were already reserved. Some of the resoucre deliveries should be due in 5:00, others in 18:00. After waiting a little while, the values did not decrease as expected

To speed up gathering the required resources, I tried re-assigning some of the traders of that station for trading with the build storage. At that point, I noticed that I could not find all of that transporters. Also, zooming out the map, I could see that the sector was explored to its borders in several straight rays. Ultimately, I could find one of the missing transporters, which was displayed two sectors away (though still being considered to be in Second Contact VII). So I searched for the second missing transporter, but could not find it on the map.
I then marked it as navigation target. A line was drawn accross the whole map, disappearing in the upper right corner while the map was fully zoomed out. Switching into cockpit view, the transporter was shown to be some billion km away

Having considered them a loss (I sold them), I tried using some of the remaining transporters. I assigned some to manually exchange wares with the build storage and observed it. It said, my transporters would arrive in 0:02 to 0:03. However, those values did not decrease either, so I tried observing said transporters and they were actually flying around, docking at stations and gathering the resources as I told them to. Eventually, the neared the build storage. A further look into the pending deliveries showed them to be due in 0:01 to 0:02.
Apparently that view was not showing <minutes>:<seconds> but <hours>:<minutes>! That means, that the outstanding deliveries of some ANT and ARG transporters are still on their way, taking up to 18 hours... I guess some of those transporters have been relocated similar to my "lost" transporters.
Has anyone observed anything similar?
Also my transporters finally arrived at the build storage, but are now waiting in line to drop off their loads (apparently they cannot overtake each other)...