Issue in client area using Thesslstore addon module

[Remitur]

There's some kind of issue using this theme with the addon module from Thesslstore ( https://marketplace.whmcs.com/product/1050-the-ssl-store-whmcs-ssl-reseller-module )

Particularly:

• in client area, for certain Digicert certificates, the download of the already issued certificate is impossible.
• this happens only for those certificates that are available in different .zip packages, and so the user needs to specify the preferred one
• When the user is asked to choose the preferred format for .zip package to download, he's stuck in a modal frame, unable to go further

In Chrome console I can find a curious error (long story short: three different "submit" buttons, all of them using the very same id and the very same name), but I'm not sure it may be related to the issue:

[DOM] Found 3 elements with non-unique id #downloadcert: (More info: https://goo.gl/9p2vKq) <input type=​"submit" class=​"btn btn-primary" id=​"downloadcert" name=​"downloaddigicert" style=​"margin-top:​ 20px;​" value=​"Download&nbsp;​Certificate">​ <input type=​"submit" class=​"btn btn-primary" id=​"downloadcert" name=​"downloaddigicert" style=​"margin-top:​ 20px;​" value=​"Download&nbsp;​Certificate">​ <input type=​"submit" class=​"btn btn-primary" id=​"downloadcert" name=​"downloaddigicert" value=​"Download Certificate With CA Bundle">​