We had this issue of composition not closing on rollout till the previous build of Muse.
However, the bug has been in the recent update, have you updated your Muse and reuploaded the site?
If you did update Muse and still see the issue, please try to rebuild the composition and see if it the issue resolved.
Please note while reuploading the site choose "upload all files" option so they don't rewrite upon the previous version and cause issues.
Updated Muse to the latest.. now when I export and put the site on my server I get the error that "Some files in the server may be missing" .. also it didnt fix the composition issue
Got the missing files thing to go away. Had to completely delete all the build folders and re-export to new folders with a different name.
Is there any other way to fix this Rollout Trigger issue on phones and tablets ?