Buttons for selling/rehoming animals suddenly missing

[L_Karika]

So, this is an issue I have experienced in the past, but it didn't show up again until just now.
I wanted to sell some of my animals. I usually do this by going to the habitat, selecting "animals" and then checking the animals off I want to sell/send to the trade center or release to the wild. But today those buttons were just not there. Not in the "animal" tab by the habitat, not even when I selected one animal by clicking on it. I had to go to the zoo's management page and select the animals from there, which is pretty annoying, to be honest.
I will check if the problem persists after I reload the game, but maybe someone else has had the problem as well and a solution?

Edit: Okay, after reloading the game the Buttons reappeared...

 

[WolfofAnarchy]

This is a known bug. If you had tried editing a sign or clicked on a facility, all those options would be gone too. We don't know what causes it but it's been around since launch and hasn't yet had any word of a fix. Reloading is the only way to fix it.