Today I have sent a little Ethereum to my address but it instantly transferred to another address. Later, I tried again sending 0.002 ETH and the same. It also transferred that same address instantly.
How to get solve this?
There are some information youre not giving us though, like how you have created that account. I will advise you to stop making use Of that address and generate a new one, cause if you continue like that the same thing will keep in repeating itself and you will be losing your ether.
I have seen something like this once on reddit. Where someone was sending eth and it keeps sending out to another address and some explained that the address was Generated by truffle develop. The same thing is what is happening to you here. I believe the solution to change that address youre using.