every time i create a mask once am done and i export it it get exported without any edits that been made already

No really as am sure the exported is JPEG, and the problem once i want to try again i see all the masks created are no longer working, so you have to start from scratch and probably won't get the same result as you don't remember the exact edits 

Hi ​@Taoufik382863570qrk, I'm just checking in to see if you are still running into this issue? Can you let us know what your export settings are and send us a screenshot of what you are seeing? Let us know how things are going. Happy to keep troubleshooting with you if needed. Thanks! ^CH

When you’re exporting, are you possibly selecting “original” (which is the unedited file) instead of JPEG?