VMs swapped even though cluster has enough memory

We have cluster with 12 hosts (1 TB RAM each). Consumed memory for hosts is about 80%. We have 3 big VMs with configured 256GB RAM on this cluster.
When I put host with this big VM to maintenance mode, DRS migrate big VM immediately to another host and VMs on this host have swapped memory then.
Is some way how to prevent this? Cluster has got enough memory, it is just needed that before migration big VM, migrate off few small VMs from destination host.DRS1.pngDRS2.png

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