When a game state is saved to a file, all details are gathered and written down. When loading, it gets read from the file and applied again to a default universe.

It is common for saving, but more so loading, to cause errors in a game that is not stable (yet). While information is gathered or applied, errors can occur because one or more details do not align between the save file details and the game code.

This is a bug. The save file should be analyzed by the developer to get an insight into which detail is causing it. In game like this, it can be anyone of thousands. For example; a ship saved with a specific cross feed setting applied to a fuel tank, in combination with another fuel tank.

This is usually fixed before a launch due to internal testing (quality assurance) or during beta testing. In this phase of the EA launch, it might have been missed thusfar.

Just send a bug report and attach your save file if you can.