Signature verification of hosted add-on failed

I have an add-on hosted on AMO, which I updated recently. And since the update when trying to install it I get

WARN Invalid XPI: signature verification failed

What is strange to me is that it passed verification & approval already.
The only thing I can think of is that I switched from JPM to Web Extensions.
Should I contact AMO reviewers/support or reupload the add-on?

Which version is causing the warning?

Version of what?
Add-on - the lates 1.4.0, new Web Extensions version.
FF - 46.0.1 (not developer version.)

Can you please change the id in your manifest.json to match exactly what it used to be in your install.rdf and upload a new version?

I.e. @steamactivityfilter instead of @SteamActivityFilter.

Done. There were slight changes made since last submission, including global variable overwrite which I got a warning about. I hope that’s not a problem but will fix it in case.
Can you please tell me, if this error with signing is an intended behavior & what should I do if I get other problems with submitted add-on in the future?
I completely forgot about the changes I made in the manifest 'cause I though that AMO validation would warn me right away if something would be wrong.

I approved the latest version and it installs just fine.

Thank you.