It could be due to two factors.
1) Junk character in Qlik which is not recognized
Remove and try by adding objects one after another in a separate sheet until you find ghost.
2) There was bug for incompatibility in earlier versions.
Can you tell your Current version of Qlik and IE. If it is less then 11.2 sr6
Upgrade to 11.2 sr6 or greater for Qlik
and Upgrade your IE to IE11.