Bug with archmage and engineering upgrade

For some reason when I give the engineering upgrade to an archmage, he seems to get the spiked shield ability, "or at least the model effect". I've tried removing all upgrades from the ability and it still does it. Anyone encountered this before?

Edit: Sorry mods, I thought I was posting in another forum. You can move this thread if need be.

Plx attach the Map

The engineering uppgrade buff has the "spiked carrapace" effect added.
EDIT: And archmage has the attachement points where it is attached.

It's also doing it with a kotg. Could be more as well, but only noticed so far with them. There is really no need to upload the map. I've tested it in a blank map by giving them the engineering ability and it still does it. However; here is a blank map where I've done it for you anyway.

Edit: You posted while I was uploading. Thanks, I'll check the buff and attachments.

No problem, it is the same with that afghanistan scepter or something in dota, that heroes with horse, or something like that (those with the "mount" attachement point) gets the spiker carrapace effect

EDIT: Look at the buff of engineering upgrade. The target art is (standard!!) the spiked carpace model(!!). At tinker model, this will not as, he does not have the right attachments, but at "horse-heroes" it will turn out. So you could make a custom buff, but some guys said that this would make the map instabel (Warcraft 3 ability guide), on the other hand, you could just remove the model.

This seems to be since the last patch, but nobody boticed so far.

Ive noticed it first time i saw it in dota, and also, i just said above that the buff got the spiked carrapace attachement.

Sorry, did not read before I posted. But you did not mention the problems that might occure when you try to slove it the one or the other way.