Vibration motion at the imaginary frequency for TS of the Claisen rearrangment
I started at PM7 niveau, where it looks like this:



and at the DFT niveau (DF-B97-D3/def2-SV(P)) it is not that different:



To summarize: Id say, it looks "as expected".

The transition state needs to connect both local minima. When you follow the animation of the normal modes above, you can see bond forming and bond breaking between either the two carbons on the left top or the carbon and the oxygen on the bottom right.



#p pm7 opt=(ts,noeigen,calcall)
8        0.416763000     -1.336451000     -0.208978000
6        1.497193000     -0.113742000      0.149606000
6       -0.772891000     -1.071748000      0.210613000
6       -1.509741000     -0.011936000     -0.327122000
6        0.829456000      1.060608000     -0.253868000
1        2.339023000     -0.475266000     -0.444938000
1        1.609073000     -0.346478000      1.210997000
6       -0.368126000      1.414823000      0.371361000
1       -0.923592000      2.282901000      0.026388000
1       -0.520920000      1.227340000      1.430860000
1        1.106186000      1.529032000     -1.191942000
1       -2.506791000      0.192973000      0.036038000
1       -1.388722000      0.264355000     -1.370246000
1       -1.103706000     -1.651275000      1.071122000

#p b97d3/def2SV/W06 opt=(ts,noeigen,calcall)
8       -0.556373000     -1.341873000     -0.246607000
6        1.267703000     -0.946693000      0.176479000
6       -1.313091000     -0.435583000      0.272443000
6       -1.504992000      0.814802000     -0.295637000
6        1.395538000      0.372483000     -0.314454000
1        1.717678000     -1.782296000     -0.375359000
1        1.166045000     -1.105900000      1.259763000
6        0.768640000      1.425447000      0.328791000
1        0.744341000      2.432184000     -0.112679000
1        0.518449000      1.360808000      1.397182000
1        1.705654000      0.503456000     -1.362984000
1       -2.163740000      1.551184000      0.190272000
1       -1.227963000      0.987609000     -1.343598000
1       -1.692271000     -0.594810000      1.314532000