From your screenshot it looks like you're trying to repair the Viridian Drill, which is listed under the Iron Drill. You should be able to scroll down to see the rest of the repairable tools.
Do you mean Google Chrome? I've tested it on Chrome and the Anvil scrolls correctly on my end. What platform are you playing on, Windows, Linux, Mac, or mobile?
For Caelo, could you clarify what seems off? Are you able to select him? His ability gives a higher light radius and immunity to ground effects. You should see a larger illuminated area underground, and he won't be affected by the Mud layer's backtracking stamina cost or the Ice layer's slippery effect.
Glad it's working for you now :)
And thanks for the info! I'll test it on my Mac using Chrome and see if I can reproduce the issue.
Edit: I did some further testing on Mac using Chrome, Firefox, and Safari, and scrolling worked fine on all of them. Sorry I wasn't able to reproduce the issue on my end.
You might want to try updating your browser, or check if any extensions could be causing unintended behavior. Since you're on a Mac, you could also try running it in Safari to see if that helps.