I clicked on open 10 bronze chests button and then it gave me an error and got nothing but all the collected chests were gone.
The chests definitely didn’t reappear in your armory?
You can open a ticket here:
Filing a ticket with support using a web browser
You can also contact support from your browser using the following URL:
Please have your Support ID (in game settings > About tab > right at the top) at hand.
You will also need to obtain a password in order to be able to log into the site. You can do that by clicking on the “Sign In” link and then select the “Get a password” option.
OP is answered. Please feel free to PM me or the mod team if you’d like this reopened.