Contracts can be void for uncertainty in certain circumstances.
Are there other options to tick meaning that nobody would be able to interpret the terms with certainty?
Any emails between the parties as to intended terms prior to signing?
Do you have an electronic copy of the contract?
If the agent has amended the 20 week term reducing it to twelve the intention was that it would run for 12 weeks. The second term stating the maximum should have been amended too.
There are different rules for interpretation. On a literal interpretation the contract is uncertain. If you were to use the purposive approach you look to the intended purpose, that you and the agent intended on a 12 week period not 20. Therefore when taking into account the 21 day notice period it is unreasonable to conclude the period should be 24 weeks.
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Ease can I ask you to accept my reply, otherwise I will not receive credit for helping you. Thanks.