I displaying multiple p:datatable \'s through ui:repeat, the following code snippet illustrates what I am doing:
This is likely related to JSF issue 1830.
Your best bet is to replace ui:repeat by another repeater which does its UINamingContainer job better, for example a . The list bullets of can be removed by CSS list-style-type: none.
If that also doesn't work, then it's maybe a bug in PrimeFaces itself.