MPLS TE Static Routes

PE1#show mpls forwarding-table 7.7.7.7 detail 
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    
Label      Label      or Tunnel Id     Switched      interface              
24         Pop Label  7.7.7.7/32       0             Tu1        point2point 

The above shows label 24, but this result shows label 26.

PE1#traceroute 7.7.7.7 source Loopback 0 numeric probe 1
Type escape sequence to abort.
Tracing the route to 7.7.7.7
VRF info: (vrf in name/id, vrf out name/id)
  1 192.168.23.3 [MPLS: Label 26 Exp 0] 4 msec
  2 192.168.36.6 4 msec
  3 192.168.67.7 6 msec

And I find the same thing in my GNS3 lab. The actual MPLS label is not the label shown by command "show mpls forwarding-table 7.7.7.7 detail ". Can you please explain why? Thanks.