First of all, thank you for your patience and sorry for the delay - there's a good amount of tickets in our queue so it takes a bit longer to respond.
Now, regarding the issue that you are currently experiencing, can you please try this:
- disable all plugins except WPML and its add-ons
- check if the issue is happening again
- if it's not, reactivate your plugins one by one, checking every time if the issue shows up again so that you can understand which plugin is causing that issue
If the issue happens even with the non-WPML plugins disabled:
- leave all the non-WPML plugins deactivated
- switch to a default theme like TwentySeventeen
- try to recreate the issue now
Please let me know how this goes and if there is no change after you follow the steps.