When using stuff like [power] and [powerCap] on display modules on multiple ships it's possible for the data to be incorrect. I was in build mode for one of my ships and zoomed over to view a display module on the other ship and noticed it was giving the power value for the wrong ship. I then entered build mode for the ship with the incorrect data and modified the display module info slightly, it then updated with the correct power values.
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I reproduced this in astronaut mode, without build mode. But it probably doesn't matter whether you're in build mode or astronaut mode. Since I originally got the bug in build mode.
1. spawn 2 cores
2. put a power capacitor on the left core
3. put a display module on both cores
4. enter [powerCap] on the left core display module. Notice that it will say 51000 power.
5. enter [powerCap] on the right core display module. Notice that they BOTH now say 50000 power.
6. go back to the left core display and edit it by adding an enter at the end of the text. It will update back to 51000 power on the display.