ok brother hcp, Thank you for your help and explanation. so i became more understand.
you are very smart. God bless you.

if my bch have been stolen, why my btc is not stolen too , because my btc remains safe, until I move it on 30 August 2017, while bch was stolen on the date of 24 August 2017, if true stolen should be the thief took also my btc.

anyway, until now the balance bch at address "1MFPQ...3WFw" not changed (still remain of my lost bch balance) since the date of the coin is estimated to be stolen, nothing seems to be able to touch it (including me). logically, the thief will move it elsewhere or spend it, in order to be collected and use for him, rather than scattered in many addresses with small and useless values.

i do not sweep transaction that bch coin, and i do not create/send that bch coin.
i only instal electrum, and then run it, then create a standard wallet with private key from blockchain. and then my bch coin gone.

I have do send that btc coin, but its bch coin I do not know why move to "1MFPQVCARrom9uH1MjtxSGHUSHTd4A3WFw", just because I instal wallet electrum with private key.

the date of moving bch coin to address "1MFPQVCARrom9uH1MjtxSGHUSHTd4A3WFw" exactly equal to the date I enter the private key to the electrum wallet I installed.

is it when i enter the private key into the wallet electrum, electrum (or bch network) make bch address "1MFPQVCARrom9uH1MjtxSGHUSHTd4A3WFw" then automatically move its coin?, and the bch address can not appear in the electrum because the electrum is not a bch wallet but a bitcoin wallet?. or what really happened .

I can give up the coin bch because the value is not much, but what if it happens to someone else who has a lot of bch coin, if the loss of bch coin is not stolen, but by the errors of the electrum wallet or error from the bch network. and of course there will be a lot of floating coin bch (no one has) in the bch network.

note : the address of the bitcoin wallet formed on the electrum is "1GXe8...LCtbc", why not "1MFPQVCARrom9uH1MjtxSGHUSHTd4A3WFw"
          and why bch coin not move to "1GXe8...LCtbc" .

after installing electrum-2-9-3 with private key from blockchain then coin bch is gone.
after being tracked it the coin bch switch to address "1MFPQVCARrom9uH1MjtxSGHUSHTd4A3WFw"
on the installed wallet electrum there is no address "1MFPQVCARrom9uH1MjtxSGHUSHTd4A3WFw"

https://blockchair.com/bitcoin-cash/transaction/243725249#i=16

how to return the coin bch ?

no, i do not transfer bch to any wallet.
I just instal electrum-2.9.3 and then run it, then create a standard wallet with private key (private key from address 1AcQ...rsMm) and the address of the electrum wallet formed is "1GXe8...LCtbc"

according to my estimation, should be the balance bch in address "1AcQ...rsMm" switch to the address "1GXe8...LCtbc", but
i do not understand, why the balance bch in address "1AcQ .... rsMm" becomes zero and switch to address "1MFPQ...A3WFw"

note:  I downloaded the electrum from the following link: https:slashslashdownload.electrum.orgslash2.9.3slashelectrum-2.9.3.exe  (slashslash => // and slash => / )

please help me,

after I installed the wallet electrum, standart wallet with existing private key (private key from my wallet at blockchain.info). my bch balance on the blockchain wallet address becomes 0 (zero). I was looking for the bch with the wallet address in the electrum but not found. but I found my bch balance in another wallet address (which is not in the electrum I installed).

Note: my blockchain wallet address : "1AcQ .... rsMm"
         my electrum wallet address    : "1GXe .... LCtbc" (electrum standard wallet with private key from "1AcQ .... rsMm")

         balance bch on address "1AcQ.... rsMm" become to zero and move to address "1MFP..... 3WFw"
         why does his bch balance not move to address "1GXe .... LCtbc" ?

how do i take my bch balance on that address ("1MFP..... 3WFw") ?

thank you for your help.