You should check what IP addresses are configured on all the connectors you have created. That should give you an idea about the way OpenVPN is getting "confused".
It is likely that it cannot differentiate between different VPN adapters or gets so confused that nothing works anymore.
Failing to see why you would want to have more than 2 VPN connections. Your computer would become some kind of bridge between VPN providers. Which is desirable to none of them. And security-wise it doesn't add much on your end either.
WinSock can (and does) become a headache, when you deviate from the standard use-cases.
However, if you do need access to multiple VPN providers, you do better to use router software like OPNSense, pfSense, MikroTik, etc. And have enough network cards in your spare PC or VM for each VPN provider you wish to access. OPNSense and pfSense are free to use, have helpful forums and paid support. MikroTik requires specific hardware, is harder to setup, but also works very well.
This is proper routing software, running on a operating system (FreeBSD) that was designed with networking in mind. On the other hand, Windows wasn't designed with networking in mind, that has been added later. The design decisions made at the time still have their impact on how well Windows handles networking.