OpenWRT + Linksys Velop Mesh

Hello everyone

The network situation in my home is like this, I have a router with Openwrt installed (as the main router, no wifi), and use the Linksys Velop mesh router for AP use (already bridged).

Now I have a problem:

When visiting certain websites, it often happens that the mobile phone can access it, but the computer cannot.

In the case of using Linksys Velop mesh as an AP like me, in addition to bridging, do I need to pay special attention? Are there any additional settings required in the Openwrt master router?

Linksys Velop Mesh: MX5300

I assume the computer with connectivity problems is wired? If so, switch off the velop system for a few minutes and test without its influence on your network to be sure what exactly happens (which isn't really clear to me, yet).