BERLIN, Nov 15 (Reuters) - Bayern Munich lost ground on Saturday when their defensive problems were exposed in a 2-2 draw at Borussia Moenchengladbach while leaders Bayer Leverkusen and Hoffenheim clinched valuable wins.

Bayern were on course for a sixth successive Bundesliga victory when they took a 2-0 lead with a Luca Toni tap-in and a Franck Ribery penalty, only for Gladbach to score twice in two second-half minutes and secure an unlikely point.

Leverkusen, who threw away a three-goal lead against Karlsruhe last weekend, showed more ruthlessness as they held on for a 2-1 win at home to Schalke 04 despite being reduced to 10 men midway through the second half.

Hoffenheim also won a tight game when they saw off VfL Wolfsburg 3-2.

Leverkusen lead the table with 28 points from 13 games, with Hoffenheim second on goal difference. Bayern are third on 25 points.