Myfaces/Omnifaces resource handlers weird behaviour - jsf-2.2

Question

We are using omnifaces (latest snapshot) resource handlers to combine and unmap resource handlers
<resource-handler>org.omnifaces.resourcehandler.CombinedResourceHandler</resource-handler>
<resource-handler>org.omnifaces.resourcehandler.CDNResourceHandler</resource-handler>
<resource-handler>org.omnifaces.resourcehandler.UnmappedResourceHandler</resource-handler>
(Also using Unmapped but it does not apply to this page)
From time to time, when projectStage is production we have broken css includes.
This is normal production html (formatted and indented):
<link rel="stylesheet" type="text/css" href="/javax.faces.resource/eNptjMEKgzAQRL8ou63Si3-TriMKiQm724PgxxcKGtDehnnzpuqSMUWBhXcpbq6xDj4jg8RsryceWryQJnITJZXPOKWoCDKunLFBg8Lg3NGDf4nysv4bn3_BkCDOT-rpdasP_QtAUUrT.css?ln=omnifaces.combined&v=1431853580000" />
<script type="text/javascript" src="/javax.faces.resource/eNp9UMsSwiAM_KKS8XXx6kd4Rpq2VCDIQ6czfrzQaunU0VM2u5uwxDqpseEC_bG_RXQDTIX1_ml_aJVVsZXGrzwFZoG0kRM_o0z3HgRpTSY3F6Lgg-MWdmzH9pDEmWJajh6hKNaN4g4rUZuiVx4VigCbNHn4oj_TJRPIWmF6VwZyS5xdXdBqK7i5cw8LPEZs_UMG0aGDAlcf_7N54eooXHGAqbxPceYynLijmFIn6gXsJJuf.js?ln=omnifaces.combined&v=1443076786000"></script>
<link rel="stylesheet" type="text/css" href="/javax.faces.resource/font-awesome/4.3.0/css/font-awesome.min.css" />
<link rel="stylesheet" type="text/css" href="/javax.faces.resource/bootstrap/3.3.4/css/bootstrap.min.css" />
<link rel="stylesheet" type="text/css" href="/javax.faces.resource/css/estilos.css?version=1443076733865" />
<link rel="stylesheet" type="text/css" href="/javax.faces.resource/css/styles.css?version=1443076733865" />
<link rel="stylesheet" type="text/css" href="/javax.faces.resource/css/icons/icons.css" />
And this is broken code:
<link rel="stylesheet" type="text/css" href="/javax.faces.resource/eNptjMEKgzAQRL8ou63Si3-TriMKiQm724PgxxcKGtDehnnzpuqSMUWBhXcpbq6xDj4jg8RsryceWryQJnITJZXPOKWoCDKunLFBg8Lg3NGDf4nysv4bn3_BkCDOT-rpdasP_QtAUUrT.css?ln=omnifaces.combined&v=1431700834000" />
<script type="text/javascript" src="/javax.faces.resource/eNp9j9EOwiAMRb8IGp2--DcInWMCRQomS_x4mYuOzOhTb--5bdOYrMdeaeTTeCuYJliKHPkRfzARXbnYwJvMKmcwMmjynsLcnIky56QidLKTB6jwY0lvXxntqJjeqYRCm7BywehQZ9jVyeOX_Z5ej4M1Dutdmym1ek4N2bu9VuGuGBq9eeTPgiY1UL7iBEup7AlS-4D0.js?ln=omnifaces.combined&v=1442328192000"></script>
<link rel="stylesheet" type="text/css" href="/javax.faces.resource/font-awesome/4.3.0/css/font-awesome.min.css" />
<link rel="stylesheet" type="text/css" href="/javax.faces.resource/javax.faces.resource/bootstrap/3.3.4/css/bootstrap.m" />
<link rel="stylesheet" type="text/css" href="/javax.faces.resource/css/estilos.css?version=1443087413884" />
<link rel="stylesheet" type="text/css" href="/javax.faces.resource/css/styles.css?version=1443087413884" />
<link rel="stylesheet" type="text/css" href="/javax.faces.resource/css/icons/icons.css" />
Note that boostrap css is broken, javax.faces.resource is 2 times and the file name is not complete.
We don't have an idea if this is myfaces (2.2.8) or omnifaces (latest snapshot). It does not happen in development mode and it only happens in production from time to time (maybe 2%). It must be something related with dates but we don't know.
This is the relevant info from web.xml
<context-param>
<param-name>org.omnifaces.CDN_RESOURCE_HANDLER_URLS</param-name>
<param-value>
cloudflare-cdn:bootstrap-select/1.3.5/bootstrap-select.min.css=https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.3.5/bootstrap-select.min.css,
cloudflare-cdn:bootstrap-select/1.3.5/bootstrap-select.min.js=https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.3.5/bootstrap-select.min.js,
</param-value>
</context-param>
<context-param>
<param-name>org.omnifaces.CDN_RESOURCE_HANDLER_DISABLED</param-name>
<param-value>#{facesContext.application.projectStage == 'Development'}</param-value>
</context-param>
<context-param>
<param-name>org.omnifaces.COMBINED_RESOURCE_HANDLER_DISABLED</param-name>
<param-value>#{facesContext.application.projectStage == 'Development'}</param-value>
</context-param>
<context-param>
<param-name>org.omnifaces.COMBINED_RESOURCE_HANDLER_EXCLUDED_RESOURCES</param-name>
<param-value>
bootstrap/3.3.4/css/bootstrap.min.css,
dashboard/dashboard.css,
css/estilos.css,css/styles.css,
font-awesome/4.3.0/css/font-awesome.min.css,
css/icons/icons.css,fancybox/3b1/jquery.fancybox.js,fancybox/3b1/jquery.fancybox-thumbs.js
</param-value>
</context-param>
<context-param>
<param-name>org.omnifaces.COMBINED_RESOURCE_HANDLER_CACHE_TTL</param-name>
<param-value>3600000</param-value>
</context-param>