Characters added to Subject when importing

Hi - After importing Outlook .PST files into local folders, I find two extra characters have been inserted at the beginning of each and every Subject field.

Usually these are spaces (actually I think they are unicode characters that render as blank tabs), except where the subject starts with Re:, FW: and Fwd: (basically any subject with a colon after its first word). In such cases there is a blank followed by either a vertical bar, dash or bottom-right corner character.

Is this a bug or a feature? Is there some way to import subjects exactly as they appear in the PST? Or is there an easy way to remove them after import?

We’re looking to migrate several legacy email systems over to a modern email software, so this is required for our assessment of eM Client.