I've inserted the standard Muse Tabbed Panel widget, and I updated the states of my tabs to my color scheme. Each state has a stroke. The content area has a stroke as well. Each content area contains text only. The last tab always has a missing bottom stroke, no matter how many tabs I add. I have 4 tabs, the last is missing the bottom stroke. I add a new tab and now the 5th is missing the bottom stroke. I tried starting fresh with a new page and a new Tabbed Panel, and once I change the colors of the tab states (background color only), the same thing happens. It makes it look like the content pertains to the Tools tab and not the first tab.
1 Correct answer
This little screencast should help to fix your issue:
But I must admitt: Muse sometimes gets a hiccup, when you edit differently defined outlines of tabbed panel triggers. Sometimes you have to try more than one time. 
And concerning the alignment of the stroke (center, inside, outside): You should make sure, that it is the same in every state. In the last seconds of the video you can see, that it isn’t the case and has to be corrected (what I forgot ).
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Replies
This little screencast should help to fix your issue:
But I must admitt: Muse sometimes gets a hiccup, when you edit differently defined outlines of tabbed panel triggers. Sometimes you have to try more than one time. 
And concerning the alignment of the stroke (center, inside, outside): You should make sure, that it is the same in every state. In the last seconds of the video you can see, that it isn’t the case and has to be corrected (what I forgot ).
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