ID generator, creates lead ID and opportunity ID in the wrong order.

Hello everyone,

I have a problem, I used ID generator Planet xRM (www.planetxrm.com/.../id-generator), to create opportunity and lead IDs, but ID was numbered in the wrong order, every time I create a new lead or opportunity, it increase ID number by 2 or 3 (XXX000023, XXX000026,....). Maybe someone had this problem and knows how to solve it??? 

Thank you for you help.