After uploading feed file in seller central my listing convert fba to fbm uk

Actually I have 4 variations of a single product. A 20 or 25 days ago i have merged 4 variation successfully. But after a couple of days, 2 of them were split automatically and the other 2 ASINs were showing on the detail page as merged.

So in this regard I contact with one of seller support representative, he/she said do it with the variation wizard, download the template file and fill it with your information and upload it using the “inventory Upload”, I did it as he said.

But right after uploading that file, all of my listings converted into FBM from FBA automatically.

Note I was a FBA seller and i have inventory in Amazon’s fulfilment center as well. Now the real Problem is My listings were converted into FBM from FBA. Please provide me solution in this regard. Thank you very much