Your code seems to be correct and the only thing I can assume that might be causing the issue is that the DOCTYPE declaration you have is not the correct one. Please, make sure that your page is XHTML compliant and test again. We are continuously working on improving the behavior when the page is in quirks mode but there are still some challenges in this matter.
If this does not help, please prepare a sample, fully runnable reproduction demo, open a new support ticket and send it to me along with detailed explanations and I will do my best to help.
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