According to your format screenshot I did not get any inconsistency. Format is black, blue, white and yellow. You have sets those variation product price before click update button and after click it is in same order and price is alright.
Hello Towhid, I Have no knowledge about technical things and which code to add where in the files. You will have to insert the code and check. As previously stated in this post I have had your team install Dokan.
Please add the code to the relevant file. Thankyou.