Problem with use of plugins and variables

[jfxcube]

someone has some idea why when i try to change some stylevars value with stylevars editor it does not work at all.
When i try to change forumbits border, for example, if i change the colorof the border, the width is automatically set to 0 and no way to set a different value
only thing is to revert the stylevar ((stylevarid: forumbits_border), same if i try to set a different width the width is set to 0.
And that's happen for a lot of other stlevar especially when i try to change border or font.
Can someone please tell me if it s a terrible bug cause it's getting really annoying.
vB 4.1.9

Thanks a lot