Hello. My take on this is that clauses 3 and 4 are not related. Clause 3 confirms that you'll get any fees refunded if the LL withdraws. Clause 4 states that the agent is not liable for costs incurred if the LL withdraws. This means, I believe, costs you incur in preparing to move etc, rather than a deposit or tenancy fees, which would be refunded under clause 3.