How do I “activate” a Gun Mettle contract?

I bought into the Gun Mettle campaign.
My HUD says I have 2 “inactive” contracts. I'm already on the class and map specified in them. Clicking on them gives me objectives and a misformatted tooltip:
Does them being “inactive” mean I have to activate them? If so, how do I do that?
If not, why aren't they active — is there some other condition I'm not meeting?
Best Answer
Are you playing on a Valve server? Meaning one you accessed through Quick-Play. If you are not, the contracts are invalidated (I suppose to stop farming maps).
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Can you still do gun mettle contracts?
The Gun Mettle Campaign ended on September 30, 2015. Activating the Gun Mettle Campaign Pass granted a Gun Mettle Campaign Coin that would grant access to contracts and track stats during the campaign.What is a gun mettle tf2?
The Gun Mettle Campaign is a three-month event new to the Team Fortress universe. For the first time, test your mettle on a variety of skill-based contracts, with one-of-a-kind weapons and exclusive weapon cases as rewards. Get your contracts here.When was the gun mettle update tf2?
Added in August 27, 2015 Patch.The Weeknd - How Do I Make You Love Me? (Official Music Video)
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Answer 2
I tried joining a Valve server and choosing the proper class again. The second time today, it worked. Guess it's just glitchy.
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