My bad.
The "Get Movie & TV Info" and "Get from internet" functions are separate, but both are included (optional) in Auto Import, so I keep forgetting that the "Get Movie & TV Info" doesn't include the Series and Season Cover Art lookup.
The cause of your issue was probably that when MC did a bulk files lookup on TheTVDB, either as part of Auto Import or when multiple files were looked up at once with the "Get Movie & TV Info" function, MC guessed the Series incorrectly, and selecting the "Terror" show in error. That can happen when the filenames aren't clear when new files are imported. Once the incorrect Series is selected it will propagate through all other and any future Episodes, because the [TheTVDB Series ID] field is relational (only one value can be stored for each [Series]), and the content of your EPG.
The fix isn't hard though, nor does it take long, usually.
Thanks for confirming that fixed the issue.