If you start seeing double letters in an input box, it means that there was a network hiccup. If you refresh the web page, you should reconnect and be able to continue with your test.
When solving a Morbit, Pollux or Baconian cipher, you must put the answer under the corresponding solution character. This means that on a Baconian answer, four out of five answer boxes in a row should be blank and Morbit/Pollux answers should only have one letter under the characters that make up the morse code. For example if the morse code text was ●–×–●●●×–●–●×–●●×● (which corresponds to ABCDE) you should write the answer as below: Also note that the system does not grade anything that is not in the yellow underlined boxes so you do not have to fill in the morse characters or the AB of the Baconian.
Likewise for a Baconian you can only fill in one of the five positions for the Baconian letter. It can be in any of the positions, but you should only fill in a single one of them.
An quick tutorial of using the tool can be seen at https://www.youtube.com/watch?v=pcz_3ql8ebM
This would not be possible without the tireless volunteer work of a good team of developers: