"Your challenge will be flagged as custom"

[EsgibtkeinBier]

After issuing a multiplayer challenge the message:
"The game detected that the following files are modified and not suitable for multiplayer:

movement.pzdat
equipment.pzeqp

Your challenge will be flagged as custom. Continue?" appeared.
Since I am 99% sure that I haven't modified them and the fact that more than half challenges in the lobby are flagged custom makes me think that something else might be the issue here.

I am running the Steam version (Patch 1.26 - it updates automatically anyway) and I haven't purchased Soviet Corps (shame on me! I mention it since I suppose it might be related).

[nunoi]

I'm running the same version and the same thing happens to me. I do have SC installed though.

[NICKALTMAN]

Yeah I have this too. I am quite puzzled by this. But I continue and all seems normal.

[EsgibtkeinBier]

Any update on the matter?

[Shards]

Hi,

Sorry, I'd missed this thread. We'll take a look into this.

Is there any particular scenarios where this is more common than others? Is there any difference in behaviour between Steam and Slitherine Installer versions?

Thanks