While playing Dragon's of Tarkir Premier Draft, I attempted to cast Spectral Denial to counter a pretty big creature spell from my opponent. I accidentally selected 2 mana instead of 1 for (x) and attempted to undo. Something broke and it would not let me continue casting the spell, my only option was to cancel. This left multiple copies of the mana payment widget on the screen overlaid on top of one another but did not do anything when clicked on. Attempts to use the spell again ran into the same issue and I was unable to counter 2 separate large creatures that my opponent played, costing me a game that was still very much winnable and ending my reward track. I am frustrated by this as I feel it cost me a draft token by extension and if anybody knows an avenue for compensation, I would greatly appreciate it. Attached are logs and a screen shot of what this looked like after it happened.