My alternator pulley was dislodged from the alternator. It started groaning one morning and about 30k kms later the bolt fell off and left me stranded

Name: IMG-20151019-WA0009.jpg Views: 131 Size: 44.8 KB

Towed the car to the workshop and got it fixed. However, they noticed that the serpentine belt on the car was about 10mm shorter than original. This is a Continental belt from Eeuroparts with about 70k kms. Could the extra tension from the 10mm shorter belt cause this?