Two specific devices in the Zerotier network cannot be connected to each other

In my network, there are two physical machines, both of which have virtual machines. They all joined the network, including virtual machines. However, the two physical machines cannot connect each other, but other devices can connect with them each other.This problem occurs occasionally and will return to normal after a period of time.
What problem may be causing this?Can you provide some ideas? Thank you!

the IP info of frist machine

the IP info of second machine

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