Masahiro Wada's side were the only team in the top eight not to pick up maximum points in midweek and it cost them two places as they slipped to fifth.
While the point does little good in helping Chonburi close the gap on the likes of Muang Thong United and BEC Tero Sasana, it could prove important for Sisaket who edged further away from the bottom five.
The hosts had the lead at the break in the capital thanks to Romain Gasmi's penalty but Jakkraphan Pornsai's equaliser coupled with a Robert Cullen brace did the damage - with Sompong Soleb's late goal proving a consolation.
Darko Tasevski was the hero for United's city rivals Bangkok Glass - scoring twice to condemn Songhkla United to defeat.
So it proved as Erik Paartalu, Datsakorn Thonglao, Teerasil Dangda and Milan Bubalo were all on the scoresheet in a 4-0 mauling as the three-time winners moved past the 30-goal mark after 14 games of the campaign.
Sho Shimoji's brace helped BEC Tero Sasana keep in touch with the leaders - with the weekend's fixtures offering Jose Alves' men a potentially golden opportunity as Muang Thong meet third-placed Army United.
