Thanks mate.

Actually first i transferred 0.03 to my exchange address which was successful. but it also created one more transfer within same transaction of BTC 1.06 to another address.

now my address in trezor, when checked in blockchain explorer showed 1.06 btc less so i got worried. but when i checked my trezor balance then i had full amount there.

now to check again i tried to exchange 0.01 btc to eth within trezor itself.

now again two transfers were created one with 0.01 and another with 1.06 btc.

i have got eth in my trezor and the btc balance is also showing correct in trezor but that first address where i had all btcs now showing 2 btc less in blockchain explorer.

but in trezor everything is showing as correct.

i am sure this is something about changing address as my friend omega mentioned above.