I think the main issue is that oberlo works well for USA only, which means if the supplier changes the price for the country then Oberlo has not solution other than increasing your margin to be in the safe side. There is no solution but the following:
If you are shipping to any country other than USA, you have to first select in Aliexpress the ship to country as "USA" and then check the price, then you will check the country you are actually shipping to and compare the price, if there is a difference then Aliexpress seller is actually changing the price based on the shipping destination, and you can only solve this by changing the supplier to another one who is keeping the price same for all countries..
Or just remove the item and replace by another one, I tried so many ways but nothing worked. You can also change the price manually if you have few items. Also, be careful of chinese new year, they stop working for 16 days starting from 5-7 Feb until 20-22 Feb