This has been discussed numerous times before. Please use the Q&A or search function next time...
Originally Abe's speaking voice was more or less just Lorne pitched up. For the rest of the Abe installments, Lorne decided to change Abe's voice to make him sound less cryptic and more of the clumsy, hapless hero we've come to love. As far as a canonical explanation goes, I think we settled on his voice changing with age.
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