Cookies downgraded to session

I'm not sure if this is a Cloudflare issue or not, but signs point that way...

My app sets a "remember me" cookie on login with a 30 day expiry. It always used to work fine, but recently I've seen that when they reach the browser, they are being saved as session cookies without the expiry date.

When running my local server, I can see the cookie stored correctly; and debugging on the live server shows that all the correct cookie data is being output by the server.

I'm becoming more and more convinced that something happening as the site proxies through CF is modifying or removing the expiry from the cookie (nothing has changed in my own code).

Any ideas? Anoyone else seen this?
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