Well, seems that equilab has a problem with the combo selector.
Put this range for the opponent
77-22,KJs-KTs,Q9s+,J9s+,T8s+,98s,87s,76s,65s,QJo,JTo
and this cards as the hero cards
6d5d
then put the board
8h3s7d Jd 4c
Then if you choose the straight combo for the opponent, equilab will include
T8, 89 as straight .
It is not the first time that I see a problem like this so I think that is a bug.