Why is there no access to some local resources behind VPN (Ip tunnel)?

Question

Computer networks

There is a network controlled by the router 2011UiAS-2HnD (172.16.15.254), the L3 trendnet switch (switch1 - 172.16.15.201) is connected to it, 2 more L3 switches are connected to it (switch 2 - 172.16.15.200) and (switch 3 - 172.16 .15.203).

An IPsec tunnel connection has been established between my home router and my work network.
The problem is the following - there is access to part of the network from my home PC, but not to part. For example, I have access to switch 2, but I do not have access to switch 1 and switch 3, I have access to part of the equipment connected to switch 1, but not to the other, although they have the same subnet and the same VLAN.
The network uses 3 VLANs.
Mikrotik itself sees and pings all addresses within the network, the problem is only on the routing on the router.
Firewall rules do not interfere - I tried to disable and prescribe specific rules between networks - it does not work.