Did you "create a new seed", did you use your TREZOR seed with "I already have a seed" or did you select the "use a hardware device" option?
If you selected "create a new seed" and then sent funds from Trezor to Electrum (or used your Trezor seed with the "I already have a seed" option) and then transferred the money to Bitpay... then it's highly likely that your Electrum wallet has been compromised...
If you selected the "use a hardware device" option, and used your Trezor device through Electrum, then I would think that it is very unlikely that your wallet has been compromised.