I took a look at the test question and both spellings of the verbs (both new and old versions) are accepted for this question. I took a look at your test history and I can see what happened. I am transferring your query directly to the Helpdesk to answer in more details.
I hope this is helpful.
Bonne journée !
Tim, I think you may be confusing having 2 different accepted conjugations that apply to the verb asseoir/s'asseoir, which are not dependent on whether the infinitive is spelled as 'asseoir/'s'asseoir' or 'assoir/s'assoir', with now also having 2 different forms of spelling asseoir/s'asseoir (traditional or old) or assoir/s'assoir (rectified or new).
The spelling reforms affected the infinitive; the two accepted but different conjugations remain the same. The conjugations give rise to quite different forms, and they are indeed used in mixed fashion in current French speech. Have a look at the links for clarification :
Conjugate reflexive verb s'asseoir in the present tense in French (Le Présent)
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