Then those files are set up incorrectly. Every one of the three multi-sig files should show the same addresses and the same balance when you open them. This probably explains why you cannot currently spend your coins.

In the first instance, I would try creating a brand new Electrum wallet using your two hardware devices and your Electrum seed phrase, and without importing any master public keys/xpubs/ypubs/zpubs. This should create a new 2-of-3 multi-sig wallet which shows your coins, and which you can spend from. This is safe enough to do on your current computer since you are still protected by your hardware wallets. If doing this generates a different wallet with different addresses, then we have other issues to address.