Please note that it you do not integrate vBET with vBSEO, then it will work, but links will not be translated. Ii is better for your SEO to integrate and have links translated, so we advice this. If you have issues with integration - first make sure you made everything as it is displayed. Then open new thread with bug report for that. Also please write which vBSEO version are you using.
About default styles for forums. First - please tell does it also doesn't work when guest cache is disabled. 2nd - please describe how you paired default style with forum? Is it some vBuletn configuration (where) or it is done by some mod. We need details to be able to reproduce the issue and solve it. Also we need to know is it really a bug, or some integration issue.